-ey bbb bbd bbe bbs bby bdb bdd bde bds bdy be- beb bed bee bes bey bsb bsd bse bss bsy by- byd bye bys dbb dbd dbe dbs dby ddb ddd dde dds ddy de- deb ded dee des dey dsb dsd dse dss dsy dy- dyb dyd dye dys dyy ebb ebd ebe ebs eby ed- edb edd ede eds edy eeb eed eee ees eey es- esb esd ese ess esy eyd eye eys sbb sbd sbe sbs sby sdb sdd sde sds sdy se- seb sed see ses sey ss- ssb ssd sse sss sy- syb syd sye sys ybe ybs yby yde yds ydy yeb yed yee yes yey ysb yse yss ysy yyb yye yys yyy