I'd suggest adding test cases in which xlow<0 (and maybe also xhigh<0).
Find the sum of all the numbers of the input vector
Project Euler: Problem 7, Nth prime
Matrix which contains the values of an other matrix A at the given locations.
Getting the indices from a matrice
Duplicate a character
Test if a Number is a Palindrome without using any String Operations
Return the first and last character of a string
Project Euler: Problem 16, Sums of Digits of Powers of Two
Reverse the Words (not letters) of a String
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