n-p-n nnooo no-no no-op nonno nonop nonot noort noron norro nortt norvo notno noto- noton notto novo- novot ntoro onont onoon onorn onoto onpop onpot onto- ontoo ontop ooooo oovoo opnto opovo oppon opto- optot optto ornon ornot orono orton ortoo otono ototo otpor otrov ottov p-n-p po-on po-po ponor ponto poopo poort popon popop popov poppo porn- porno poro- poron porro porto poton potoo potop potor potro potto povvo pptnt prntr proor proot prop- propn propp propr propt prot- proto provn provo prtor ptprn ptpro ptprr ptprt ro-ro ronno ronto roto- roton rotor rotot rotto rovon rprop rptor rttov t-pop t-top tntnt tono- tonto topo- topon topor topot toppo topto toron torpo torro torto toto- toton totoo totop tprot trnov trono troon troop trop- tropo trott trovo ttttt v-pop vontp voorn voron votto vroon