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.
Which doors are open?
Get the area codes from a list of phone numbers
Increment a number, given its digits
Back to basics 10 - Max Float
Back to basics 19 - character types
Bottles of beer
Back to basics 5 - Clipboard
Back to basics 25 - Valid variable names
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