A technique that I've used while fuzz testing string algorithms is to run all tests first with small alphabets (perhaps 4-6 characters), then with full alphabet

A technique that I've used while fuzz testing string algorithms is to run all tests first with small alphabets (perhaps 4-6 characters), then with full alphabets. It seems to increase the probability of finding bugs with relatively small runs. My work is on a personal project, not algorithms that have been in production for years, so it's possible that this wouldn't be that productive.