I'd suggest adding test cases in which xlow<0 (and maybe also xhigh<0).
Check to see if a Sudoku Puzzle is Solved
Find best placement for ordered dominoes (harder)
Doubling elements in a vector
Largest Twin Primes
02 - Vector Variables 3
Lychrel Number Test (Inspired by Project Euler Problem 55)
Roll the Dice!
Pull the variable y_correct from the Caller's Workspace
ASCII Birthday Cake
Reverse the Words (not letters) of a String
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