Permutations For SREERF

Here are all the permutations for the letters SREERF.

sref sref serf serf serf serf sref sref rsef rsef resf refs resf refs rfes rfes esrf esrf ersf erfs ersf erfs efrs efrs esrf esrf ersf erfs ersf erfs efrs efrs rsef rsef resf refs resf refs rfes rfes fres fres fers fers fers fers fres fres