Test if arguments of the function are all variables (workspace variables names).
Return 1 if yes, 0 if no.
For example :
length!! and not "not isempty"... good point!
Get the area codes from a list of phone numbers
High school cafeteria
Find best placement for ordered dominoes (harder)
Make an awesome ramp for a tiny motorcycle stuntman
Numbers spiral diagonals (Part 1)
Find indices of diagonal elements
Mysterious digits operation (easy)
Numbers spiral diagonals (Part 2)
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