-er -ey a-a a-b a-c aaa aab aac aae aar aas aay ab- aba abb abc abe abr abs aby ac- aca acb acc ace acr acs acy aea aeb aec aee aer aes aey ar- ara arb arc are arr ars ary as- asa asb asc ase asr ass asy ay- aya ayc aye ayr ays baa bab bac bae bar bas bay bba bbb bbc bbe bbr bbs bby bca bcb bcc bce bcr bcs bcy be- bea beb bec bee ber bes bey bra brb bre brr brs bry bsa bsb bsc bse bsr bss bsy by- bya byc bye byr bys c-- caa cab cac cae car cas cay cba cbb cbc cbe cbr cbs cby cca ccb ccc cce ccr ccs ce- cea ceb cec cee cer ces cey cra crb crc cre crr crs cry csa csb csc cse csr css csy cya cyb cyc cye cyr cys eaa eab eac eae ear eas eba ebb ebc ebe ebr ebs eby ec- eca ecb ecc ece ecr ecs eea eeb eec eee eer ees eey era erb erc ere err ers ery es- esa esb esc ese esr ess esy eya eyc eye eyr eys ra- raa rab rac rae rar ras ray rba rbb rbc rbe rbr rbs rca rcb rcc rce rcr rcs re- rea reb rec ree rer res rey rra rrb rrc rrr rrs rsa rsb rsc rse rsr rss ry- rya ryc rye ryr rys ryy saa sab sac sae sar sas say sba sbb sbc sbe sbr sbs sby sca scb scc sce scr scs se- sea seb sec see ser ses sey sr- sra srb src sre srr srs sry ss- ssa ssb ssc sse ssr sss sy- sya syb syc sye syr sys yaa yab yac yae yar yas yay ybc ybe ybr ybs yby yca ycc yce ycs ycy yea yeb yec yee yer yes yey yra yrc yre yrs ysa ysb ysc yse ysr yss ysy yyb yyc yye yys yyy