OEIS link for a description of lunar arithmetic
Simply take the larger digit.
Summing Digits within Text
Get the area codes from a list of phone numbers
Back to basics 14 - Keywords
Use of regexp
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
Delete the rows in the middle
Duration of a trip in minutes
Modular multiplicative inverse
String permutations on phone keyboard
Calculate trends in time series
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