Udacity provides the feedback: "Your code passed 7 of 11 tests. It failed on test: input = [0,0,0]." The tests are arranged in order of normal input to increas

Udacity provides the feedback: "Your code passed 7 of 11 tests. It failed on test: input = [0,0,0]." The tests are arranged in order of normal input to increasingly strange user input, i.e., edge cases. Should be easy enough for Codecademy to implement that.