so good solutions
Return the first and last characters of a character array
How long is the longest prime diagonal?
Given area find sides
Add a block to a model
5 Prime Numbers
Fill-a-pix - Solver (basic)
Divisible by n, prime divisors - 11, 13, 17, & 19
Divisible by 16
Lights Out 13 - 5x5, three stages, x moves
Self-similarity 3 - Every other pair of terms
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