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Start training on this collection. Each time you skip or complete a kata you will be taken to the next kata in the series. Once you cycle through the items in the collection you will revert back to your normal training routine.

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4 kyu
Sum Strings as Numbers
44,051nicknovitski
Strings
Big Integers
Algorithms
5 kyu
Lazy Chain
250dfrown123
Functional Programming
Fundamentals
5 kyu
Count IP Addresses
28,811xDranik
Algorithms
5 kyu
Mean Square Error
20,282kylehill
Arrays
Mathematics
Algorithms
5 kyu
Rot13
92,733Rubikan
Ciphers
Fundamentals
5 kyu
Which x for that sum?
2,600g964
Fundamentals
Mathematics
5 kyu
Probabilities for Sums in Rolling Cubic Dice
2,623raulbc777
Mathematics
Statistics
Probability
Logic
4 kyu
Strip Comments
52,932jhoffner
Strings
Algorithms
5 kyu
Compose functions (T Combinator)
2,265kylehill
Functional Programming
Fundamentals
5 kyu
Hello W... wait what?
1,908MentalAtom
Puzzles
Algorithms
5 kyu
flatten()
4,486jhoffner
Arrays
Algorithms
5 kyu
Memoized Fibonacci
23,231edalorzo
Memoization
Refactoring
5 kyu
Readability is King
1,001matstc
Mathematics
Algorithms
4 kyu
Permutation by number
89Stein256
Algorithms
Mathematics
Strings
Permutations
5 kyu
Prime Numbers
1,573user3765829
Algorithms
4 kyu
Snail
76,718stevenbarragan
Arrays
Algorithms
5 kyu
The Clockwise Spiral
3,876alex.budiakov
Arrays
Puzzles
4 kyu
Magnet particules in boxes
7,669g964
Mathematics
Matrix
Algorithms
4 kyu
Twice linear
23,130g964
Mathematics
Algorithms
5 kyu
Regex Password Validation
28,620EricFreeman
Regular Expressions
Fundamentals
5 kyu
Calculating with Functions
82,676BattleRattle
Functional Programming
4 kyu
Pyramid Slide Down
18,293rodentrabies
Algorithms
Dynamic Programming
4 kyu
Large Factorials
9,251matt c
Algorithms
Big Integers
4 kyu
Adding Big Numbers
32,549Becojo
Mathematics
Big Integers
Algorithms
4 kyu
Human readable duration format
83,270davazp
Strings
Date Time
Algorithms
4 kyu
Boggle Word Checker
3,606evan-eleven
Arrays
Recursion
Puzzles