-th c-- ccc cch cco ccs cct ccz ch- chc chh cho chs cht chz co- coc coh coo cos cot coz csc csh cso css cst csz ctc cth cto cts ctt ctz cz- czc czo czt hcc hch hco hcs hct hhc hhh hho hhs hht hhz hoc hoh hoo hos hot hsc hsh hss hst hsz htc hth hto hts htt htz hzo hzs hzt oc- occ och oco ocs oct ocz ohc ohh oho ohs oht oo- ooc ooh ooo oos oot os- osc osh oso oss ost ot- otc oth oto ots ott otz ozo ozs ozt ozz scc sch sco scs sct sh- shc shh sho shs sht soc soh soo sos sot soz ss- ssc ssh sso sss sst ssz stc sth sto sts stt stz tcc tch tco tcs tct th- thc thh tho ths tht thz to- toc toh too tos tot toz tsc tsh tso tss tst ttc tth tto tts ttt tzs zco zcs zhc zho zhs zo- zoc zoo zos zot zsh zst zsz zzs zzt zzz