-th c-- ccc cch cco ccp cct ch- chc chh cho chp cht co- coc coh coo cop cot cpc cph cpo cpp cpt ctc cth cto ctp ctt hcc hch hco hcp hct hhc hhh hho hhp hht hoc hoh hoo hop hot hpc hph hpo hpp hpt htc hth hto htp htt oc- occ och oco ocp oct ohc ohh oho ohp oht oo- ooc ooh ooo oop oot op- opc oph opo opp opt ot- otc oth oto otp ott p-p pcc pch pco pcp pct phc pho php pht poc poh poo pop pot ppc pph ppo ppp ppt pt- ptc pth pto ptp ptt tcc tch tco tcp tct th- thc thh tho thp tht to- toc toh too top tot tpc tph tpo tpp tpt ttc tth tto ttp ttt