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