-ey a-a a-b a-c aaa aab aac aad aae aas aay ab- aba abb abc abd abe abs aby ac- aca acb acc acd ace acs acy ad- ada adb adc add ade ads ady aea aeb aec aed aee aes aey as- asa asb asc asd ase ass asy ay- aya ayc ayd aye ays baa bab bac bad bae bas bay bba bbb bbc bbd bbe bbs bby bca bcb bcc bcd bce bcs bcy bda bdb bdc bdd bde bds bdy be- bea beb bec bed bee bes bey bsa bsb bsc bsd bse bss bsy by- bya byc byd bye bys c-- caa cab cac cad cae cas cay cba cbb cbc cbd cbe cbs cby cca ccb ccc ccd cce ccs cda cdb cdc cdd cde cds cdy ce- cea ceb cec ced cee ces cey csa csb csc csd cse css csy cya cyb cyc cyd cye cys daa dab dac dad dae das day dba dbb dbc dbd dbe dbs dby dca dcb dcc dcd dce dcs dda ddb ddc ddd dde dds ddy de- dea deb dec ded dee des dey dsa dsb dsc dsd dse dss dsy dy- dya dyb dyc dyd dye dys dyy eaa eab eac ead eae eas eba ebb ebc ebd ebe ebs eby ec- eca ecb ecc ecd ece ecs ed- eda edb edc edd ede eds edy eea eeb eec eed eee ees eey es- esa esb esc esd ese ess esy eya eyc eyd eye eys saa sab sac sad sae sas say sba sbb sbc sbd sbe sbs sby sca scb scc scd sce scs sda sdb sdc sdd sde sds sdy se- sea seb sec sed see ses sey ss- ssa ssb ssc ssd sse sss sy- sya syb syc syd sye sys yaa yab yac yad yae yas yay ybc ybe ybs yby yca ycc ycd yce ycs ycy yda yde yds ydy yea yeb yec yed yee yes yey ysa ysb ysc yse yss ysy yyb yyc yye yys yyy