Test for randomness could be tightened (cf. Solution 1490988).
Extract leading non-zero digit
Get the area codes from a list of phone numbers
Back to basics 6 - Column Vector
Back to basics 17 - white space
Create incrementing array
05 - Vector Equations 2
07 - Common functions and indexing 1
03 - Matrix Variables 2
02 - Vector Variables 5
07 - Common functions and indexing 5
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