I'd suggest adding test cases in which xlow<0 (and maybe also xhigh<0).
Find state names that start with the letter N
Get the length of a given vector
Check if number exists in vector
Sophie Germain prime
Fahrenheit to Celsius converter
Triangle Numbers Below N
Square Digits Number Chain Terminal Value (Inspired by Project Euler Problem 92)
Read a Soroban Abacus
Clock Hand Angle 1
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