cccc ccnc ccoc cctc cctt chch chnc chno choc choh chon choo chto chtt cnco cnoh cntc coch coco coct cohn coho con- conc conn cono cont cooh coon coot cotc coth cotn coto cott ctot cttn hccc hcch hhhh hoch hocn hohn hoho hono hont hoon hoot hoth hoto hott htcc htoh nccc nccn ncct nchc ncnc ncoc nctc nhcc nhnn nhon nnnn nnot nntn noch noco noct nohn noho noht non- nonn nono nont noo- noon nooo noot not- noth noto nott ntcc nthn ntht ntto occc occn occt ocht ocon oct- octo ohcc ohho ohno ohoh ohto onc- onco onct onno onon ont- ontc onto ooho oont oooh oooo otho oto- otoh oton otoo otto tccc tch- tchh tcho tcnn tcon tctc thch thnt thon thoo thot tncc toch toco toho tonh tonn tono tooh toon toot totc toth toto tott ttcn tton tttt