-th c-- ccc cce cch ccp cct ccx ce- cec cee ceh cep cet cex ch- chc che chh chp cht chx cpc cpe cph cpp cpt cpx ctc cte cth ctp ctt ctx cxc cxh cxp cxt cxx ec- ecc ece ech ect ecx eec eee eep eet eex ehc ehe ehh ehp eht ep- epc epe eph epp ept epx etc ete eth etp ett etx ex- exc exe exh exp ext exx hcc hce hch hcp hct he- hec hee heh hep het hex hhc hhe hhh hhp hht hpc hpe hph hpp hpt htc hte hth htp htt htx hxc p-p pcc pce pch pcp pct pcx pec pee peh pep pet pex phc phe php pht phx ppc ppe pph ppp ppt ppx pt- ptc pte pth ptp ptt ptx pxc pxe pxt t-x tcc tce tch tcp tct tcx te- tec tee teh tep tet tex th- thc the thh thp tht thx tpc tpe tph tpp tpt tpx ttc tte tth ttp ttt ttx txe txt xch xcp xcx xee xep xet xex xhp xht xpc xpe xpp xpt xtc xtp xtx xxp xxx