I'd suggest adding test cases in which xlow<0 (and maybe also xhigh<0).
Find the sum of the elements in the "second" diagonal
Is the Point in a Circle?
Create a vector whose elements depend on the previous element
Count up then down
Find the Best Hotels
Pig Latin to English Translator
English to Pig Latin Translator
Test if two numbers have the same digits
ASCII Birthday Cake
Check to see if a Sudoku Puzzle is Solved
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