c-cor c-p-c c-pop ccccc cnnnn cntrc co-co co-np co-op cocc- cocco cocon cocto conco concr cono- conon conop conor contn conto contr coopt coppo copr- copro copto corno coro- coron corop corot corto coton cott- cotto cpctc croco croon croop croot cropc cropo crott n-p-n nnooo no-no no-op noct- nocto nonno nonop nonot nonpc noort norco noroc noron norro nortt notno noto- noton notpc notto nrotc ntoro ocorn octo- octon octor onco- onont onoon onorn onoto onpop onpot onto- ontoo ontop ooooo opcon opnto oppon opto- optot optto orcon orcop ornon ornot oroco orono orton ortoo otono ototo otpor p-n-p pctct po-on po-po pocno pocop ponor ponto poopo poort popco popon popop poppo porcn porco porn- porno poro- poron porro porto potco potoc poton potoo potop potor potro potto pptnt prntr proor proot prop- propn propp propr propt prot- proto prtor ptprc ptprn ptpro ptprr ptprt r-co- ro-ro rocco rocor ronco ronno ronto roto- roton rotor rotot rotto rprop rptor t-pop t-top tntnt tocco toco- tonco tono- tonto topo- topon topor topot toppo topto toron torpo torro torto toto- toton totoo totop tprot troco tronc trono troon troop trop- tropo trott ttttt