Sums with Excluded Digits
Replace NaNs with the number that appears to its left in the row.
Test if a Number is a Palindrome without using any String Operations
Angle between two vectors
Make a full wave rectifier
Back to basics 24 - Symbolic variables
Valid Chess Moves
Back to basics 20 - singleton dimensions
Toolbox check part 3
Back to basics 21 - Matrix replicating
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