Increment a number, given its digits
Calculate the area of a triangle between three points
Back to basics - mean of corner elements of a matrix
Sum the 'edge' values of a matrix
Dice roll - opposite faces
Divisible by 10
Rule of mixtures (composites) - lower and upper bounds
Lights Out 6 - 5x5, 13 moves
Lights Out 1 - 5x5, 3 moves
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