Count the number of occurrences of "OXO" in rows, columns, diagonals and anti-diagonals.
>> board = ['OOX'
>> board = [' O '
Find state names that start with the letter N
peta to nano (x-ray)
Return elements unique to either input
Implement simple rotation cypher
Basic arrays operations.
Cut an orange
Which permutation is it?
Open coded lock.
Pernicious Anniversary Problem
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