-er -ey c-- ccc cce ccp ccr cct ccx ce- cec cee cep cer cet cex cey cpc cpe cpp cpr cpt cpx crc cre crp crr crt crx cry ctc cte ctp ctr ctt ctx cty cxc cxp cxr cxt cxx cyc cye cyp cyr cyt ec- ecc ece ecr ect ecx eec eee eep eer eet eex eey ep- epc epe epp epr ept epx erc ere erp err ert ery etc ete etp etr ett etx ety ex- exc exe exp exr ext exx exy eyc eye eyp eyr eyt p-p pcc pce pcp pcr pct pcx pec pee pep per pet pex pey ppc ppe ppp ppr ppt ppx prc pre prp prr prt prx pry pt- ptc pte ptp ptr ptt ptx pty pxc pxe pxr pxt py- pyc pye pyr pyt pyx rcc rce rcp rcr rct rcx re- rec ree rep rer ret rex rey rpc rpe rpp rpr rpt rpx rrc rrp rrr rrt rtc rte rtp rtr rtt rtx rty rxp rxr ry- ryc rye ryr ryy t-x tcc tce tcp tcr tct tcx te- tec tee tep ter tet tex tey tpc tpe tpp tpr tpt tpx trc tre trp trr trt trx try ttc tte ttp ttr ttt ttx tty txe txt tyc tye typ tyr tyt xcp xcr xcx xee xep xer xet xex xpc xpe xpp xpt xrc xrt xrx xry xtc xtp xtr xtx xty xxp xxx xxy xyp xyr xyy ycc yce ycp ycy yec yee yep yer yet yex yey yrc yre yrp yrt ytc yte ytp ytr ytt yxe yxy yyc yye yyt yyy