-ey bbb bbd bbe bbo bbs bbt bby bdb bdd bde bdo bds bdt bdy be- beb bed bee beo bes bet bey bob bod boe boo bos bot boy bsb bsd bse bso bss bst bsy btb btd bte bto bts btt bty by- byd bye byo bys byt dbb dbd dbe dbo dbs dbt dby ddb ddd dde ddo dds ddt ddy de- deb ded dee deo des det dey dob dod doe doo dos dot doy dsb dsd dse dso dss dst dsy dtb dtd dte dto dts dtt dty dy- dyb dyd dye dyo dys dyy ebb ebd ebe ebo ebs ebt eby ed- edb edd ede edo eds edt edy eeb eed eee eeo ees eet eey eo- eob eod eoe eoo eos eot es- esb esd ese eso ess est esy etb etd ete eto ets ett ety eyd eye eyo eys eyt ob- obb obd obe obo obs obt oby odb odd ode odo ods odt oeb oed oee oeo oes oet oey oo- oob ood ooo oos oot os- osb osd ose oso oss ost ot- otb otd ote oto ots ott oyd oye oyo oys sbb sbd sbe sbo sbs sbt sby sdb sdd sde sdo sds sdt sdy se- seb sed see seo ses set sey sob sod soe soo sos sot soy ss- ssb ssd sse sso sss sst stb std ste sto sts stt sty sy- syb syd sye sys syt tbb tbd tbe tbo tbs tbt tdb tdd tde tdo tds tdt tdy te- teb ted tee teo tes tet tey to- tob tod toe too tos tot toy tsb tsd tse tso tss tst tsy ttb ttd tte tto tts ttt tty tyd tye tyo tys tyt ybe ybs yby yde ydo yds ydt ydy yeb yed yee yeo yes yet yey yob yod yoe yoo yos yot yoy ysb yse yso yss yst ysy ytd yte yto yts ytt yyb yye yys yyt yyy