cccc ccci ccic ccii ccoc cctc cctt cicc cici cico cict ciii ciit citi cito citt city coco coct coit coot cotc coti coto cott coty coyo coyt ctic ctot cyc- cycc cyt- cyto cyy- cyyc iccc icci icco icct icoc iiii iiio iiit iioi iioo iitt ioci ioii ioio ioit iooi iooo ioto itic itoi itoo itto itty occc occi occt oct- octi octo octy oici oiii oitc oiti oooo ooty otic otit oto- otoo otoy otti otto tccc tctc ticc tico tiit titc titi tito titt tiyi tiyo to-y toci toco toit toot totc toti toto tott toty toyo toyt ttoy tttt tyco tyti tyto tytt tyty yccc yctc yiti yoit yoot yott yoyo yyyy