Data Science Interview Prep Course - Aced (formerly Exponent)

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Data Science Interview Prep

Land your dream data science role at Google, Amazon, Microsoft, Meta, Apple, and other top companies. Learn from mock interviews, frameworks, and advice from senior candidates. Practice statistics, experimentation, coding, SQL, machine learning, behavioral interviews, and more.

Top data science interview questions and answers

Coding exercises and AI feedback

Full-length mock interviews & walkthroughs

4.8/5

5,300+ students

Updated Aug 2026

Get all access for $12 / month Try free preview

Taught by

Apurvaa SubramaniamData Scientist, Instacart, Amazon

Shreyas LakhtakiaSenior Data Scientist, AI, Stanford, BCG

Angelica C.ML Engineer, Google

Tyler ShangSenior Data Science Manager, Tinder

Joshua BernhardDirector of Data, Intuit, Houzz

WeiChun ChangData Scientist, Houzz

Dmitri MirakyanProduct Data Science, Opendoor

Jimmy WuML Engineer, Amazon

Aazel T.Data Science Intern, Meta

Apurvaa SubramaniamData Scientist, Instacart, Amazon

Shreyas LakhtakiaSenior Data Scientist, AI, Stanford, BCG

Angelica C.ML Engineer, Google

Tyler ShangSenior Data Science Manager, Tinder

Joshua BernhardDirector of Data, Intuit, Houzz

WeiChun ChangData Scientist, Houzz

Dmitri MirakyanProduct Data Science, Opendoor

Jimmy WuML Engineer, Amazon

Aazel T.Data Science Intern, Meta

Featured videos

Start with a free lesson, then unlock all 63 video lessons.

\ \ Free\ \ Types of Data Science Roles](/content/courses/data-science/data-scientist-introduction/data-scientist-interview-roles/index.html) \ \ Members\ \ Design Campaign Experiment and Success Metrics](/content/upgrade?course=data-science&src=course/index.html) \ \ Members\ \ Implement a 2D Convolutional Filter](/content/upgrade?course=data-science&src=course/index.html)

Interview prep trusted by 1M+ candidates who've landed jobs at

\ \ Unlock all lessons\ \ 63 videos · AI mocks · certificate\ \ Get access — $12/mo](/content/upgrade?course=data-science&src=course/index.html)

What people like about this course

Philip S.

Senior Data Scientist, Microsoft

I have a lot of academic training but was struggling to translate that into business value in interviews. Exponent's materials were super valuable...

Peter

Data Infrastructure Engineer, Faire

I'm very happy with my experience and would recommend Exponent to anyone looking for a tech job.

Lucas G.

Data Scientist, Meta

Best technical interview content available! Exponent provides exceptional technical expertise, and their mock interviews are invaluable for...

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What you'll find in this course

8 courses

63 videos

60 hours

Data Scientist Interviews Introduction

3 lessons

1 video

Welcome to Exponent’s Data Science Interview Course!\ \ Free \ \ Types of Data Science Roles\ \ Free](/content/courses/data-science/data-scientist-introduction/data-scientist-interview-roles/index.html) The Data Science Interview Loop

Statistics and Experimentation Questions

8 modules

77 lessons

23 videos

Understand what types of statistics questions are asked in data science interviews and what interviewers are looking for. Review fundamental statistics concepts through concise refresher lessons. Learn how to design A/B and hypothesis tests in interviews.

Overview

2 lessons

Introduction to Statistics and Experimentation Questions Rubric for Statistics and Experimentation Questions

Data Preprocessing

8 lessons·2 videos

Learn how to clean and transform data so your analyses are accurate and reliable.

How to Answer Data Preprocessing and Quality Questions Descriptive Statistics Data Cleaning Data Transformation Sampling Bias \ \ Handling Outliers](/content/courses/data-science/statistics-experimentation-questions/handling-outliers/index.html) \ \ Normalization vs. Standardization](/content/courses/data-science/statistics-experimentation-questions/normalization-vs-standardization/index.html)

Probability

7 lessons·4 videos

Focus on the core probability concepts that interviewers actually test.

Introduction to Probability Questions\ \ Free How to Answer Probability Questions Probability Concepts \ \ What is a P-value?](/content/courses/data-science/statistics-experimentation-questions/what-is-p-value/index.html) \ \ Calculate Expected Cost of Coupon Usage](/content/courses/data-science/statistics-experimentation-questions/expected-cost-coupon/index.html) \ \ Calculate Conditional Probability (Bayes Theorem)](/content/courses/data-science/statistics-experimentation-questions/calculate-conditional-probability-bayes/index.html) \ \ Calculate Probability of a Fair Coin](/content/courses/data-science/statistics-experimentation-questions/calculate-probability-of-a-fair-coin/index.html)

Regression

9 lessons·4 videos

Master regression basics and interpretations to tackle real-world analytical problems confidently.

Introduction to Regression Questions\ \ Free Linear Regression Concepts Logistic Regression Concepts How to Answer Regression Questions \ \ Select Input for Modeling When Handling Multicollinearity](/content/courses/data-science/statistics-experimentation-questions/select-input-modeling-handling-multicollinearity/index.html) \ \ Gradient Descent and Model Optimization](/content/courses/data-science/statistics-experimentation-questions/gradient-descent-and-model-optimization/index.html) \ \ Advantages and Limitations of Linear Regression](/content/courses/data-science/statistics-experimentation-questions/advantages-and-limitations-of-linear-regression/index.html) Modeling Linear Regression \ \ R-Squared, Multicollinearity, and Statistical Tests](/content/courses/data-science/statistics-experimentation-questions/r-squared-multicollinearity-statistical-tests/index.html)

Hypothesis Tests & Confidence Intervals

4 lessons·1 video

Understand which tests to use, why, and how to interpret the results like an expert.

Introduction to Hypothesis Tests and Confidence Intervals Questions\ \ Free How to Answer Hypothesis Test Questions How to Calculate Confidence Intervals \ \ Define Confidence Level in Confidence Interval](/content/courses/data-science/statistics-experimentation-questions/define-confidence-level-interval/index.html)

Power Analysis & Impact Sizing

5 lessons·2 videos

Know how to evaluate the strength and relevance of your experiments to make data-driven recommendations.

Introduction to Power Analysis and Impact Sizing\ \ Free How to Answer Impact Sizing Questions How to Answer Power Analysis Questions \ \ Determine Sample Size](/content/courses/data-science/statistics-experimentation-questions/determine-sample-size/index.html) \ \ Calculate Revenue from New Vertical Expansion](/content/courses/data-science/statistics-experimentation-questions/calculate-revenue-new-vertical/index.html)

Experimentation

14 lessons·10 videos

Learn how to design and analyze experiments that produce clear, actionable insights.

Introduction to Experimentation Questions\ \ Free How to Answer A/B Testing Questions Alternatives to A/B Testing \ \ Design Campaign Experiment and Success Metrics](/content/courses/data-science/statistics-experimentation-questions/run-campaign-success-metrics-experiment/index.html) \ \ Design A/B test for New Campaign](/content/courses/data-science/statistics-experimentation-questions/design-ab-test/index.html) \ \ Design A/B Testing Alternatives](/content/courses/data-science/statistics-experimentation-questions/design-ab-test-alternatives/index.html) \ \ Design Test for Stories Reaction Feature](/content/courses/data-science/statistics-experimentation-questions/design-test-stories-reaction-feature/index.html) \ \ Design Test for Driver Matching Algorithm](/content/courses/data-science/statistics-experimentation-questions/design-test-driver-matching-algorithm/index.html) \ \ Increase Sales through A/B Testing](/content/courses/data-science/statistics-experimentation-questions/increase-sales-ab-test/index.html) \ \ Adjust P-value Threshold](/content/courses/data-science/statistics-experimentation-questions/adjust-p-value-threshold/index.html) \ \ Faster A/B Testing and Statistical Significance](/content/courses/data-science/statistics-experimentation-questions/faster-ab-testing-and-statistical-significance/index.html) A/B Testing Email Campaign \ \ Analyze A/B Test Results for Checkout](/content/courses/data-science/statistics-experimentation-questions/analyze-a-b-test-results-for-checkout/index.html) \ \ T-test Assumptions and Alternatives](/content/courses/data-science/statistics-experimentation-questions/t-test-assumptions-and-alternatives/index.html)

Practice Questions

28 lessons

Apply what you’ve learned with common statistics and experimentation problems you’re likely to face in interviews.

Standard Deviation vs Range Power vs. Confidence Level Expectation of Variance Checking Random Assignment in A/B Testing What is A/B testing Statistical Background behind Power Type I vs. Type II Error Multiple t-tests Covariance vs. Correlation Common Pitfalls of A/B Testing Explain Confidence Interval Central Limit Theorem and its Usefulness Z and T-tests Hypothesis Testing and p-values Hypothesis Testing for Coin Flip Hypothesis Testing for Amazon Distribution of Daily Minutes on Facebook Search Distribution Correlation and Outliers False Positive Distribution Biased vs Unbiased Estimator Statistical Significance vs Practical Significant Sampling Distribution in Inferential Statistics Novelty and Primary Effects in Experiments Non-Normal Distribution Network Effects in A/B Testing What is A/B testing and when should it be used? Verifying Random A/B Testing Groups

Data Communications Questions

2 modules

7 lessons

3 videos

2 hours

Learn how to present and communicate results effectively in any data science or analytics interview round. Understand how to solve ambiguous interview questions through effective communication, specifically for case studies, past project presentations, and take-home assignments.

Past Projects

4 lessons·3 videos·1 hr

Pick the right projects, structure your story, and answer common interview prompts with confidence. Watch expert mock interviews to see standout presentations in action.

How to Present Past Projects \ \ Present a Past Project 1](/content/courses/data-science/data-communications-questions/past-project-example-1/index.html) \ \ Present a Past Project 2](/content/courses/data-science/data-communications-questions/past-project-example-2/index.html) \ \ Present a Past Project 3](/content/courses/data-science/data-communications-questions/past-project-example-3/index.html)

Take-home Assignments

3 lessons·20 min

Learn when to accept a take-home, what to expect, and how to tackle both defined and open-ended tasks to showcase your skills effectively.

Introduction to the Take-home Assignment \ \ Free How to Create a Take-home for Defined Tasks How to Create a Take-home for Open-ended Tasks

Python Coding Questions for Data Scientists

2 modules

18 lessons

2 videos

Master Python coding interviews focused on data science by exploring advanced data manipulation with Pandas and conducting statistical analysis and experiments. Gain proficiency in handling and transforming datasets, performing thorough statistical tests, and designing experiments with Python. Perfect for those looking to excel in technical interviews that assess data handling and analytical skills.

Data Manipulation

9 lessons

Master common tasks for cleaning and transforming data using pandas.

Lowest Earning Employees\ \ Easy Unsold Products\ \ Easy Top Product Lines\ \ Medium Revenue by Customer City\ \ Medium Rank Salary by Department\ \ Medium Average Distance Between Cities\ \ Medium Overstretched Employees\ \ Hard Time Between Two Events\ \ Hard Improving Students\ \ Hard

Statistics & Experimentation

9 lessons·2 videos

Apply Python to run statistical tests, analyze experiments, and interpret results.

Total Outfit Combinations\ \ Easy Climbing Stairs\ \ Easy Biased Coin Flip Histogram\ \ Easy \ \ Predict Results from a Fair Coin\ \ Easy](/content/courses/data-science/python-coding-data-scientist-questions/predict-coin-flip/index.html) Handle Missing Data\ \ Medium Interpolate Data\ \ Medium Convert Biased Coin to Fair Coin\ \ Medium \ \ Find Statistical Evidence for Conversion Rate\ \ Medium](/content/courses/data-science/python-coding-data-scientist-questions/statistical-evidence-conversion-rate/index.html) Session Data Analysis\ \ Hard

SQL Interviews

9 modules

98 lessons

6 videos

Prepare for SQL interviews by practicing syntax basics, aggregations, and window functions. Learn how to manipulate data, write complex queries, and analyze information from diverse data sets.

Overview

3 lessons

Introduction to SQL and Its History\ \ Free How to Answer SQL Interview Questions Relationships and Relational Database Concepts

Fast Track

9 lessons

In a rush? This is your minimum viable prep.

How to Prep SQL Interviews Fast\ \ Free SQL Interview Patterns\ \ Free SQL Interview Test Questions\ \ Free Joins & Duplicate Control\ \ Free Window Functions Essentials\ \ Free Grouping, Having, Conditional Aggregation & NULL-Safe Metrics\ \ Free Subqueries & CTEs\ \ Free Dates & Bucketing\ \ Free How to Perform in a SQL Interview \ \ Free

Basic SQL Querying

8 lessons

Basic SQL Syntax The WHERE Clause Logical operators: AND, OR, NOT Finding similar results with LIKE and Wildcards Querying Missing Values with IS NULL and IS NOT NULL Sorting data with ORDER BY Using LIMIT and OFFSET IN and BETWEEN

Aggregations

7 lessons

Introduction to SQL Aggregations GROUP BY and HAVING Counting with COUNT and COUNT(DISTINCT) SUM Calculating Average, Min, and Max with SQL Conditional values with CASE WHEN ... ELSE Working with Date and Time: DATE_TRUNC, DATEDIFF, and more

Joins

8 lessons

Joins Inner Joins LEFT and RIGHT Joins Full Outer Joins Unions Cross Joins Subqueries and Derived tables Common Table Expressions (CTEs)

Window Functions

4 lessons

Introduction to Window Functions Window functions: RANK and DENSE RANK Window functions: ROW_NUMBER Window functions: LAG

Easy Practice Questions

14 lessons·3 videos

Introduction to SQL Practice Questions\ \ Free Top Earning Employees\ \ Easy Monthly Post Success Analysis\ \ FreeEasy High Volume Low Success\ \ FreeEasy \ \ Tree Node\ \ Easy](/content/courses/data-science/sql-interviews/tree-node/index.html) Marketing Campaign Duration\ \ FreeEasy Find Average Purchase Value\ \ FreeEasy Survey Sampling\ \ FreeEasy Items on Sale\ \ Easy Reddit Users\ \ Easy Lyft Ride Requests\ \ Easy \ \ E-commerce: Units Ordered Yesterday \ \ Easy](/content/courses/data-science/sql-interviews/e-commerce-i/index.html) \ \ E-commerce: Units Ordered Last Week\ \ Easy](/content/courses/data-science/sql-interviews/e-commerce-ii/index.html) E-commerce: Earliest Order by Customer\ \ Easy

Medium Practice Questions

31 lessons·2 videos

Sales by Customer City\ \ Medium Most Recent Transaction\ \ Medium Calculate Test Scores\ \ Medium Project Budgets\ \ FreeMedium Instagram Likes\ \ Medium \ \ Employee Earnings\ \ Medium](/content/courses/data-science/sql-interviews/employee-earnings/index.html) Post Success By Interface\ \ FreeMedium Post Success By Age Group\ \ FreeMedium Find Campaign Purchases\ \ FreeMedium Find Revenue by Department\ \ Medium Find Customers by Department\ \ Medium Find Second Highest Order\ \ Medium Find Conversion Rates\ \ FreeMedium Find Customer Lifetime Value (LTV)\ \ Medium Marketing Channel Attribution\ \ Medium \ \ Analyze Monthly Customer Transactions\ \ Free](/content/courses/data-science/sql-interviews/mock-interview-analyze-monthly-customer-transactions/index.html) Sales Report\ \ Medium Monthly Sales Report\ \ Medium Top Customer by Orders\ \ Medium TV Show Watch Time\ \ Medium Nth Ranked Player\ \ Medium Number of Direct Reports\ \ Medium Fraudulent Transactions\ \ Medium EPA Temperature Monitoring\ \ Medium Video Game Matchmaking\ \ Medium Walmart Inventory Status\ \ Medium Unique Chat Conversations\ \ Medium Netflix Genre Ratings\ \ FreeMedium Remove Duplicate Emails\ \ Medium Consecutive Logins\ \ Medium E-commerce: Total Orders by Category\ \ Medium

Hard Practice Questions

14 lessons·1 video

Total Transaction Volume\ \ FreeHard Top Salaries by Department\ \ FreeHard Employee Hierarchy\ \ FreeHard Post Success After Failure\ \ Hard Find Top Customer by Year\ \ Hard Find Monthly Revenue Growth\ \ FreeHard Initial Contact Attribution\ \ Hard Ranking Salary Deviations\ \ Hard Game Leaderboard\ \ Hard Amazon Order Status\ \ FreeHard Duolingo Leaderboards\ \ FreeHard Validate Bitcoin Transactions\ \ Hard E-commerce: Second Earliest Order\ \ FreeHard \ \ SQL Stored Procedures](/content/courses/data-science/sql-interviews/advanced-sql-stored-procedures/index.html)

Product Sense and Case Studies

3 modules

32 lessons

13 videos

Product sense is about understanding user needs and designing intuitive, high-impact solutions. In interviews, it’s tested through questions that assess your creativity, empathy, and ability to prioritize. Case studies evaluate your structured thinking—how you break down ambiguous problems and reason through them like a strategic business partner.

Analytical Questions

16 lessons·5 videos

\ \ Introduction to Analytical Questions\ \ Free](/content/courses/data-science/product-sense-case-studies-questions/intro-analytical/index.html) How to Answer A/B Testing Questions How to Answer Metrics Questions Rubric for Analytical Interviews Pick YouTube's Key Metrics A/B Test Google's Homepage Top 3 Variables of Uber's Passenger Pickup \ \ Instagram Reels Success Metrics](/content/courses/data-science/product-sense-case-studies-questions/instagram-reels/index.html) \ \ LinkedIn Events Success Metrics](/content/courses/data-science/product-sense-case-studies-questions/linkedin-events/index.html) \ \ A/B Test Google Maps](/content/courses/data-science/product-sense-case-studies-questions/mock-analytical-abtest-maps/index.html) Measure Success for Slack Connect \ \ Measure Success for Instagram Discovery](/content/courses/data-science/product-sense-case-studies-questions/measure-success-instagram-discovery/index.html) A/B Testing Email Campaign Improving Facebook’s DAU Diagnosing Instagram DAU Drop More Analytical/Execution Practice

Product Design Questions

4 lessons·3 videos

\ \ Introduction to Product Design Questions](/content/courses/data-science/product-sense-case-studies-questions/intro-product/index.html) How to Answer Product Design Questions \ \ Design Facebook Movies\ \ Free](/content/courses/data-science/product-sense-case-studies-questions/mock-interview-facebook-movies/index.html) \ \ Design Audio Product for Meta](/content/courses/data-science/product-sense-case-studies-questions/design-audio-product-meta/index.html)

Case Studies

12 lessons·5 videos

Introduction to the Case Study Interview\ \ Free How to Answer Case Study Interview Questions \ \ Investigate Sudden Viewer Drop at Meta](/content/courses/data-science/product-sense-case-studies-questions/investigate-sudden-viewer-drop/index.html) \ \ Integrate Data in Netflix License Renewal](/content/courses/data-science/product-sense-case-studies-questions/use-data-netflix-license-renewal/index.html) \ \ Balance Ads vs Follower Instagram Posts](/content/courses/data-science/product-sense-case-studies-questions/balance-instagram-ads-followers/index.html) \ \ Onsite Technical Round: Combination of SQL, Statistics, and Case Study](/content/courses/data-science/product-sense-case-studies-questions/onsite-technical-round-combination-of-sql-statistics-and-case-study/index.html) \ \ Improve Snap Camera Speed](/content/courses/data-science/product-sense-case-studies-questions/snap-camera-speed/index.html) Instagram Messaging with 3rd Party Facebook Video for Individuals with Hearing Disabilities Evaluating Facebook’s Emotion Scale Identifying Conversations in Comments Measuring Product-Market Fit for Meta Video

ML Coding Questions for Data Scientists

2 modules

10 lessons

7 videos

Master coding interviews that assess your knowledge of ML frameworks. Learn how to implement core ML components. Particularly important for DS candidates applying for roles in machine learning and algorithms.

Overview

3 lessons

Introduction to ML Coding Interviews\ \ Free How to Answer ML Coding Interview Questions Rubric for ML Coding Interviews

Mock Interviews & Practice Questions

7 lessons·7 videos

Practice actual ML coding questions and compare your answers with experts.

\ \ Implement the KNN Algorithm\ \ Easy](/content/courses/data-science/ml-coding-data-scientist-questions/implement-k-nearest-neighbor-algorithm/index.html) \ \ Implement K-Means Clustering \ \ Easy](/content/courses/data-science/ml-coding-data-scientist-questions/implement-k-means-algorithm/index.html) \ \ Optimal Value of K in K-Means](/content/courses/data-science/ml-coding-data-scientist-questions/optimal-value-k-in-kmeans/index.html) \ \ Implement a 2D Convolutional Filter\ \ Medium](/content/courses/data-science/ml-coding-data-scientist-questions/implement-2d-convolutional-filter/index.html) \ \ Predict User App Deletion\ \ Hard](/content/courses/data-science/ml-coding-data-scientist-questions/predict-likelihood-app-delete/index.html) \ \ Predict Harmful Text\ \ Hard](/content/courses/data-science/ml-coding-data-scientist-questions/predict-harmful-text-ml/index.html) \ \ Split Dataset for Training, Evaluation, Testing](/content/courses/data-science/ml-coding-data-scientist-questions/split-dataset-training-evaluation-testing/index.html)

ML Concepts Questions for Data Scientists

3 modules

29 lessons

8 videos

Learn best practices for answering ML concepts questions. Particularly important for data science candidates applying for roles in machine learning and algorithms.

Overview

7 lessons·1 video

\ \ Introduction to ML Concepts Interviews](/content/courses/data-science/ml-concepts-questions-data-scientists/ml-concepts-intro/index.html) How to Answer ML Data Handling Questions How to Answer ML Model Questions How to Answer ML Evaluation Questions How to Answer ML Production Questions Rubric for ML Concepts Interviews ML Interviews Glossary

Model & Algorithm Fundamentals

9 lessons

All you need to know about the most commonly tested models and algorithms, from the core math to practical implementation.

Linear Regression\ \ Free Logistic Regression Decision Trees Linear SVM K Nearest Neighbors Neural Network K-Means Clustering Density-Based Spatial Clustering (DBSCAN) Supervised Model Evaluation

Mock Interviews & Practice Questions

13 lessons·7 videos

\ \ Describe Linear Regression](/content/courses/data-science/ml-concepts-questions-data-scientists/describe-linear-regression/index.html) Explain the Bias-Variance Tradeoff \ \ Explain “Training" and “Testing” Data](/content/courses/data-science/ml-concepts-questions-data-scientists/training-testing-data/index.html) \ \ Discuss Batch, Mini-Batch, Stochastic Gradient Descent](/content/courses/data-science/ml-concepts-questions-data-scientists/gradient-descent/index.html) \ \ Explain Feature Scaling and Normalization](/content/courses/data-science/ml-concepts-questions-data-scientists/feature-scaling-normalization/index.html) \ \ Explain Classification vs Regression](/content/courses/data-science/ml-concepts-questions-data-scientists/classification-vs-regression/index.html) \ \ Identify When Model Needs Refresh](/content/courses/data-science/ml-concepts-questions-data-scientists/model-refresh/index.html) \ \ Handle an Exploding Gradient](/content/courses/data-science/ml-concepts-questions-data-scientists/exploding-gradient/index.html) Build Fraud Detection Model Describe How Decision Trees are Created Measure Algorithm Success Compare Forecast Models to Other ML Models Build Recommendation System for Online Courses

Get this course, plus everything Aced has to offer

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Question database and community answers Get full access to our database of 3,000+ verified interview questions and browse by company, role, or interview stage. Post your answers and get community feedback.

Access all our company interview guides We'll walk you step-by-step through every part of the interview process, from the recruiting phone screen through the final round.

Join our members-only Slack community Connect with your peers in our 25,000-member strong Slack community. Ask questions, practice interviews, and make connections at top tech companies.

Mock interviews with AI and peers Practice real interview questions with unlimited mock interviews, including early access to our new AI interviewer.

Frequently asked questions

What's included in the Exponent membership?

With a paid monthly or annual membership, you’ll get:

Full access to this interview course and 100+ other interview prep courses and modules.
Hundreds of real interview questions, answers, and walkthroughs
Self-paced video lessons with expert interview answer frameworks
Access to interview rubrics and sample answers for common interview types
Unlimited access to peer-to-peer mock interviews for product sense, behavioral, and more.
Access to AI tools for mock interview feedback
A complete library of company-specific interview guides
Membership in our private Slack community

Does Exponent offer interview coaching in addition to this course?

Yes! You can purchase coaching for interview prep and career coaching by visiting https://www.tryexponent.com/coaching.

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