Anagram
Lists a word's distinct rearrangements (all up to seven letters, a sample beyond, with the exact count) and the dictionary words among them, and finds anagrams of up to five words by backtracking over the letter pool. Scientists once published claims as anagrams to fix priority: Robert Hooke printed “ceiiinosssttuu” in 1676 and in 1678 read it as “ut tensio sic vis”, his law of the spring.