Which doors are open?
Implement a ROT13 cipher
Determine if a Given Number is a Triangle Number
letter yes yes & letter no no
Length of the hypotenuse
Lights Out 5 - 5x5, 10 moves
Pattern Recognition 3 - Variable Unit and Array Length (including cell arrays)
Combined Ages 2 - Symmetric, n ≥ 3
Cycling — Critical Power
Rule of mixtures (composites) - lower and upper bounds
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