c-p-c c-pop ccccc cnnnn co-co co-np co-op cocc- cocco cocon cocto conco cono- conon conop contn conto coopt coppo copto coton cott- cotto cpctc n-p-n nnooo no-no no-op noct- nocto nonno nonop nonot nonpc notno noto- noton notpc notto octo- octon onco- onont onoon onoto onpop onpot onto- ontoo ontop ooooo opcon opnto oppon opto- optot optto otono ototo p-n-p pctct po-on po-po pocno pocop ponto poopo popco popon popop poppo potco potoc poton potoo potop potto pptnt t-pop t-top tntnt tocco toco- tonco tono- tonto topo- topon topot toppo topto toto- toton totoo totop ttttt