A good opportunity to implement a hashtable: lots of collisions without it.
A re-post of Solution 1137054, because that one doesn't appear in the list of solutions, for some reason (I'm not sure why).
Make a checkerboard matrix
Indexed Probability Table
Reverse the Words (not letters) of a String
matrix of natural number
Replace multiples of 5 with NaN
Find my secret number
Replicate elements in vectors
Negation and new variables
Permute diagonal and antidiagonal
Decrypt the cypher using XOR encryption (for beginners)
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