-er -ey a-a a-c a-t aaa aac aae aar aat aax aay ac- aca acc ace acr act acx acy aea aec aee aer aet aex aey ar- ara arc are arr art arx ary at- ata atc ate atr att atx ax- axa axe axr axt axx ay- aya ayc aye ayr ayt ayx c-- caa cac cae car cat cax cay cca ccc cce ccr cct ccx ce- cea cec cee cer cet cex cey cra crc cre crr crt crx cry cta ctc cte ctr ctt ctx cty cxc cxr cxt cxx cya cyc cye cyr cyt eaa eac eae ear eat eax ec- eca ecc ece ecr ect ecx eea eec eee eer eet eex eey era erc ere err ert ery eta etc ete etr ett etx ety ex- exa exc exe exr ext exx exy eya eyc eye eyr eyt ra- raa rac rae rar rat rax ray rca rcc rce rcr rct rcx re- rea rec ree rer ret rex rey rra rrc rrr rrt rta rtc rte rtr rtt rtx rty rxr ry- rya ryc rye ryr ryy t-x taa tac tae tar tat tax tay tca tcc tce tcr tct tcx te- tea tec tee ter tet tex tey tra trc tre trr trt trx try tta ttc tte ttr ttt ttx tty txe txt tya tyc tye tyr tyt xaa xac xar xat xcr xcx xee xer xet xex xrc xrt xrx xry xtc xtr xtx xty xxx xxy xyr xyy yaa yac yae yar yat yax yay yca ycc yce ycy yea yec yee yer yet yex yey yra yrc yre yrt yta ytc yte ytr ytt yxa yxe yxy yyc yye yyt yyy