! Copyright (c) 2009 Aaron Schaefer.
! See http://factorcode.org/license.txt for BSD license.
-USING: arrays byte-arrays fry kernel math math.combinatorics math.functions
- math.parser math.primes project-euler.common sequences sets ;
+USING: arrays kernel math math.primes project-euler.common
+sequences sets ;
+FROM: project-euler.common => permutations? ;
IN: project-euler.049
! http://projecteuler.net/index.php?section=problems&id=49