cccc cccp ccnc ccnp ccnr ccoc ccpn ccpp ccpr ccrc ccrp cnco cncp cnrc cnrr coco cocp con- conc conn cono coon coop copo copp copr cor- corc corn coro corp corr crcc crcr croc cron croo crop cror crpc nccc nccn nccp nccr ncnc ncoc ncor ncpc ncrc ncrp nnnn nnpr noco non- nonn nono noo- noon nooo noop noor nor- norc norn noro norr npcc nppc nroc nron nrpc nrpn nrrc occc occn ocon ocpp ocro ocrr onc- onco onno onon onor oocr oooo opo- opon opor oppo orco ornc orno oro- oron oror orpc orro pccc pcpn pcpp pcrc pnon pnpo pnpp pnro poco ponc pono ponp poon poop poor pop- popc popo popp porc porn poro porr ppcc pppn pppo pppp pprc prcc prcp prnp pro- proc pron proo prop rccc rcnr rcon rcpo rnco rncp rocc roco ronc rono roon roop roor ropo rorc roro rpon rppn rrrr