Permutations For PRNON

Here are all the permutations for the letters PRNON.

prno prno pnro pnor ponr ponr pnro pnor rpno rpno rnpo rnop ronp ronp rnpo rnop npro npor nrpo nrop nopr norp opnr opnr ornp ornp onpr onrp onpr onrp npro npor nrpo nrop nopr norp