-ey a-a a-b a-c a-t aaa aab aac aae aao aas aat aay ab- aba abb abc abe abo abs abt aby ac- aca acb acc ace aco acs act acy aea aeb aec aee aeo aes aet aey aoa aob aoc aoe aoo aos aot as- asa asb asc ase aso ass ast asy at- ata atb atc ate ato ats att ay- aya ayc aye ayo ays ayt baa bab bac bae bao bas bat bay bba bbb bbc bbe bbo bbs bbt bby bca bcb bcc bce bco bcs bct bcy be- bea beb bec bee beo bes bet bey boa bob boc boe boo bos bot boy bsa bsb bsc bse bso bss bst bsy bta btb btc bte bto bts btt bty by- bya byc bye byo bys byt c-- caa cab cac cae cao cas cat cay cba cbb cbc cbe cbo cbs cbt cby cca ccb ccc cce cco ccs cct ce- cea ceb cec cee ceo ces cet cey co- coa cob coc coe coo cos cot coy csa csb csc cse cso css cst csy cta ctb ctc cte cto cts ctt cty cya cyb cyc cye cyo cys cyt eaa eab eac eae eao eas eat eba ebb ebc ebe ebo ebs ebt eby ec- eca ecb ecc ece eco ecs ect eea eeb eec eee eeo ees eet eey eo- eoa eob eoc eoe eoo eos eot es- esa esb esc ese eso ess est esy eta etb etc ete eto ets ett ety eya eyc eye eyo eys eyt oaa oab oac oae oao oas oat ob- oba obb obc obe obo obs obt oby oc- oca ocb occ oco ocs oct oea oeb oec oee oeo oes oet oey oo- ooa oob ooc ooo oos oot os- osa osb osc ose oso oss ost ot- ota otb otc ote oto ots ott oya oye oyo oys saa sab sac sae sao sas sat say sba sbb sbc sbe sbo sbs sbt sby sca scb scc sce sco scs sct se- sea seb sec see seo ses set sey soa sob soc soe soo sos sot soy ss- ssa ssb ssc sse sso sss sst sta stb stc ste sto sts stt sty sy- sya syb syc sye sys syt taa tab tac tae tao tas tat tay tba tbb tbc tbe tbo tbs tbt tca tcb tcc tce tco tcs tct te- tea teb tec tee teo tes tet tey to- toa tob toc toe too tos tot toy tsa tsb tsc tse tso tss tst tsy tta ttb ttc tte tto tts ttt tty tya tyc tye tyo tys tyt yaa yab yac yae yao yas yat yay ybc ybe ybs yby yca ycc yce yco ycs ycy yea yeb yec yee yeo yes yet yey yob yoc yoe yoo yos yot yoy ysa ysb ysc yse yso yss yst ysy yta ytc yte yto yts ytt yyb yyc yye yys yyt yyy