-th c-- ccc cch cck ccs cct ch- chc chh chk chs cht ckc ckh cks ckt csc csh csk css cst ctc cth ctk cts ctt hcc hch hck hcs hct hhc hhh hhk hhs hht hkh hkk hks hkt hsc hsh hsk hss hst htc hth htk hts htt k-t kcc kch kck kcs kct khh khk khs kkc kkh kkk kks kkt ksc ksh ksk kss kst ktc kth ktk kts ktt scc sch sck scs sct sh- shc shh shk shs sht sk- skc skh skk sks skt ss- ssc ssh ssk sss sst stc sth stk sts stt tcc tch tck tcs tct th- thc thh thk ths tht tkc tkk tks tkt tsc tsh tsk tss tst ttc tth ttk tts ttt