cccc cccp cccv cchp cchr ccoc ccpp ccpr ccrc ccrp ccvo chch chcp choc choh choo chop chor chov chpp chpr chrc chro chrp chrr chvo coch coco cocp coho cooh coop coph copo copp copr cor- corc coro corp corr covo cpvc crcc crcr croc croh croo crop cror crpc cvcc cvrr hccc hcch hcpc hcrp hhhh hhpc hoch hocr hoho hoop hoor hopo hopp horc horo horr hpcc hrpc hrpp hrrc hvcc occc ocpp ocro ocrr ohcc ohho ohoh oocr ooho oooh oooo opo- opor oppo orch orco oro- oror orpc orph orro orvr ovo- ovoo ovpp pccc pchp pcpp pcrc phcc phoh phoo phrr poch poco pooh poop poor pop- popc popo popp porc poro porr povo ppcc pppo pppp pprc prcc prcp pro- proc proo prop prov pvco rccc rcpo rcvr rhcp rhoc rhoh rocc roch roco rohr roop roor ropo rorc roro rovo rpho rrrr rv-c rvvh vhhh voho vooc voor vor- voro vpro vroc vvvv