When the input is true, return 'on', otherwise, return 'off'.
The problem statement is misleading. 'if x' and 'if isequal(x, true)' are different conditions.
Check if sorted
Back to basics 26 - Keywords
Check if number exists in vector
Generate a string like abbcccddddeeeee
Power supply: 230V to 115V
Number of problems
Wayfinding 4 - Crossing, level 2
Order of things - 4
Robust alignment of coordinate system
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