perp perr pgcc pgce pgde pger pgrc phcc phe- phek phi- phip phrr picc pice pich pici pick picr pide pied piep pier pigc pigg pigh pigk pigp piip pike piki pikk pipe pipi pipp pirc pire pirg piri pirk pirr pkge pkig ppcc ppcd ppci ppdk pper ppgi pphi ppic ppid ppie ppig ppih pppd pppp pprc prcc prcd prcp pre- prec pred pree preg prek prep pri- prid prie prig prii prpd prrd prri rccc rcdc rcde rcep rcgc rcic rcid rcpd rcpi rcrd rcrg rder rdpc recc recd rece rech reci reck recp recr redc redd rede redh redi redr reed reek reep regd rege regi regr rehe rehi reid reii reik reir reke reki repe repi repp repr rerd rere rerg reri rhce rhcg rhcp rhee ricc rice rich rick ridc ridd ride ridi ried riek riep rier rige rigg righ rigi rike riki rikk ripd ripe ripi ripp ripr rire riri rpdp rpii rred rrrr