PERFINS

ef en er es fe if in is ne pe pi re si

efs ens ern ers fen fer fes fie fin fir ifs ins ire nip pen per pes pie pin pis psi ref rei rep res rif rin rip sei sen ser sin sip sir sri

erns fens fern fine fins fire firn firs ires neif nips pein pens peri pier pies pine pins pirn refs reif rein reis reps rife rifs rins ripe rips rise seif serf sine sipe sire snip spin