-er -ey a-a a-b a-c a-t aaa aab aac aae aao aar aat aay ab- aba abb abc abe abo abr abt aby ac- aca acb acc ace aco acr act acy aea aeb aec aee aeo aer aet aey aoa aob aoc aoe aoo aor aot ar- ara arb arc are aro arr art ary at- ata atb atc ate ato atr att ay- aya ayc aye ayo ayr ayt baa bab bac bae bao bar bat bay bba bbb bbc bbe bbo bbr bbt bby bca bcb bcc bce bco bcr bct bcy be- bea beb bec bee beo ber bet bey boa bob boc boe boo bor bot boy bra brb bre bro brr brt bry bta btb btc bte bto btr btt bty by- bya byc bye byo byr byt c-- caa cab cac cae cao car cat cay cba cbb cbc cbe cbo cbr cbt cby cca ccb ccc cce cco ccr cct ce- cea ceb cec cee ceo cer cet cey co- coa cob coc coe coo cor cot coy cra crb crc cre cro crr crt cry cta ctb ctc cte cto ctr ctt cty cya cyb cyc cye cyo cyr cyt eaa eab eac eae eao ear eat eba ebb ebc ebe ebo ebr ebt eby ec- eca ecb ecc ece eco ecr ect eea eeb eec eee eeo eer eet eey eo- eoa eob eoc eoe eoo eor eot era erb erc ere ero err ert ery eta etb etc ete eto etr ett ety eya eyc eye eyo eyr eyt oaa oab oac oae oao oar oat ob- oba obb obc obe obo obr obt oby oc- oca ocb occ oco ocr oct oea oeb oec oee oeo oer oet oey oo- ooa oob ooc ooo oor oot or- ora orb orc ore oro orr ort ory ot- ota otb otc ote oto otr ott oya oye oyo ra- raa rab rac rae rao rar rat ray rba rbb rbc rbe rbo rbr rbt rca rcb rcc rce rco rcr rct re- rea reb rec ree reo rer ret rey roa rob roc roe roo ror rot roy rra rrb rrc rrr rrt rta rtb rtc rte rto rtr rtt rty ry- rya ryc rye ryo ryr ryy taa tab tac tae tao tar tat tay tba tbb tbc tbe tbo tbr tbt tca tcb tcc tce tco tcr tct te- tea teb tec tee teo ter tet tey to- toa tob toc toe too tor tot toy tra trb trc tre tro trr trt try tta ttb ttc tte tto ttr ttt tty tya tyc tye tyo tyr tyt yaa yab yac yae yao yar yat yay ybc ybe ybr yby yca ycc yce yco ycy yea yeb yec yee yeo yer yet yey yob yoc yoe yoo yor yot yoy yra yrc yre yro yrt yta ytc yte yto ytr ytt yyb yyc yye yyt yyy