cccc ccnc ccoc cctc cctt cnco cntc coco coct con- conc conn cono cont coon coot cotc cotn coto cott ctot cttn cxxx nccc nccn ncct ncnc ncoc nctc nnnn nnot nntn noco noct non- nonn nono nont nonx noo- noon nooo noot not- noto nott ntcc ntto occc occn occt ocon oct- octo onc- onco onct onno onon ont- ontc onto oont oooo oto- oton otoo otto oxo- oxon oxox oxxo tccc tcnn tcon tctc tncc toco tonn tono toon toot totc toto tott tox- toxo toxt ttcn tton tttt txcn xcon xoco xoxo xxxo xxxx