Permutations For PREFRE

Here are all the permutations for the letters PREFRE.

pref pref perf perf pref pref perf perf rpef rpef repf refp rfep rfep repf refp eprf eprf erpf erfp efrp efrp erpf erfp frep frep ferp ferp frep frep ferp ferp rpef rpef repf refp rfep rfep repf refp eprf eprf erpf erfp efrp efrp erpf erfp