I'd suggest adding test cases in which xlow<0 (and maybe also xhigh<0).
Swap the first and last columns
given 3 sides, find area of this triangle
2 b | ~ 2 b
Generate a random matrix A of (1,-1)
Check to see if a Sudoku Puzzle is Solved
Return the 'Size' of a String of Code
Test if a Number is a Palindrome without using any String Operations
Number of Circles in a Number
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