Covering some basic topics I haven't seen elsewhere on Cody.
Return a string that is the path to the system's current temp directory
The assert is wrong. Dirs should not be tested as equal strings - slash can be omitted.
radius of a spherical planet
Create a two dimensional zero matrix
Back to basics 23 - Triangular matrix
Back to basics 17 - white space
Back to basics 5 - Clipboard
Back to basics 25 - Valid variable names
7 segment LED display
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