I'd suggest adding test cases in which xlow<0 (and maybe also xhigh<0).
Find the alphabetic word product
Is A the inverse of B?
Count up then down
The Answer to Life, the Universe, and Everything
Triangle Numbers Below N
Solve the Sudoku Row
Check to see if a Sudoku Puzzle is Solved
English to Pig Latin Translator
Generalized N-Cards Problem
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