Permutations For PRFOO

Here are all the permutations for the letters PRFOO.

prof prof pfor pfor porf pofr porf pofr rpof rpof rfop rfop ropf rofp ropf rofp fpor fpor frop frop fopr forp fopr forp oprf opfr orpf orfp ofpr ofrp oprf opfr orpf orfp ofpr ofrp