-er -ey c-- ccc cce cco ccp ccr ccx ce- cec cee ceo cep cer cex cey co- coc coe coo cop cor cox coy cpc cpe cpo cpp cpr cpx crc cre cro crp crr crx cry cxc cxo cxp cxr cxx cyc cye cyo cyp cyr ec- ecc ece eco ecr ecx eec eee eeo eep eer eex eey eo- eoc eoe eoo eop eor ep- epc epe epo epp epr epx erc ere ero erp err ery ex- exc exe exo exp exr exx exy eyc eye eyo eyp eyr oc- occ oco ocp ocr ocx oec oee oeo oep oer oex oey oo- ooc ooo oop oor oox op- opc ope opo opp opr opx opy or- orc ore oro orp orr orx ory ox- oxc oxo oxx oxy oye oyo p-p pcc pce pco pcp pcr pcx pec pee peo pep per pex pey poc poe poo pop por pox poy ppc ppe ppo ppp ppr ppx prc pre pro prp prr prx pry pxc pxe pxr py- pyc pye pyo pyr pyx rcc rce rco rcp rcr rcx re- rec ree reo rep rer rex rey roc roe roo rop ror rox roy rpc rpe rpo rpp rpr rpx rrc rrp rrr rxp rxr ry- ryc rye ryo ryr ryy xcp xcr xcx xee xep xer xex xoc xoo xop xor xox xpc xpe xpo xpp xrc xrx xry xxo xxp xxx xxy xyp xyr xyy ycc yce yco ycp ycy yec yee yeo yep yer yex yey yoc yoe yoo yop yor yox yoy ypo yrc yre yro yrp yxe yxy yyc yye yyy