-th c-- ccc cch cco cct ch- chc chh cho cht chy co- coc coh coo cot coy ctc cth cto ctt cty cyc cyo cyt hcc hch hco hct hcy hhc hhh hho hht hhy hoc hoh hoo hot hoy htc hth hto htt hty hy- hyc hyh hyo hyt hyy oc- occ och oco oct ohc ohh oho oht oo- ooc ooh ooo oot ot- otc oth oto ott oyo tcc tch tco tct th- thc thh tho tht thy to- toc toh too tot toy ttc tth tto ttt tty tyc tyo tyt ycc ych yco ycy yhc yht yoc yoo yot yoy ytc yth yto ytt yyc yyt yyy