Combinatorics can calculate and enumerate all possible permutations, combinations, ... Combinatorics algorithms: * Permutations of letters * Anagrams of words * k-Permutations of letters * Combinations of letters * Combinations with repetitions of letters Extra features: * Displays the number of permutations/combinations/... with well formatted mathematical symbols using tex/latex * Ability to share a calculation, for instance to save it to a file or to mail the result * Unicode support, so le