-ey bbb bbc bbd bbe bbo bbs bbt bby bcb bcc bcd bce bco bcs bct bcy bdb bdc bdd bde bdo bds bdt bdy be- beb bec bed bee beo bes bet bey bob boc bod boe boo bos bot boy bsb bsc bsd bse bso bss bst bsy btb btc btd bte bto bts btt bty by- byc byd bye byo bys byt c-- cbb cbc cbd cbe cbo cbs cbt cby ccb ccc ccd cce cco ccs cct cdb cdc cdd cde cdo cds cdt cdy ce- ceb cec ced cee ceo ces cet cey co- cob coc cod coe coo cos cot coy csb csc csd cse cso css cst csy ctb ctc ctd cte cto cts ctt cty cyb cyc cyd cye cyo cys cyt dbb dbc dbd dbe dbo dbs dbt dby dcb dcc dcd dce dco dcs dct ddb ddc ddd dde ddo dds ddt ddy de- deb dec ded dee deo des det dey dob doc dod doe doo dos dot doy dsb dsc dsd dse dso dss dst dsy dtb dtc dtd dte dto dts dtt dty dy- dyb dyc dyd dye dyo dys dyy ebb ebc ebd ebe ebo ebs ebt eby ec- ecb ecc ecd ece eco ecs ect ed- edb edc edd ede edo eds edt edy eeb eec eed eee eeo ees eet eey eo- eob eoc eod eoe eoo eos eot es- esb esc esd ese eso ess est esy etb etc etd ete eto ets ett ety eyc eyd eye eyo eys eyt ob- obb obc obd obe obo obs obt oby oc- ocb occ ocd oco ocs oct odb odc odd ode odo ods odt oeb oec oed oee oeo oes oet oey oo- oob ooc ood ooo oos oot os- osb osc osd ose oso oss ost ot- otb otc otd ote oto ots ott oyd oye oyo oys sbb sbc sbd sbe sbo sbs sbt sby scb scc scd sce sco scs sct sdb sdc sdd sde sdo sds sdt sdy se- seb sec sed see seo ses set sey sob soc sod soe soo sos sot soy ss- ssb ssc ssd sse sso sss sst stb stc std ste sto sts stt sty sy- syb syc syd sye sys syt tbb tbc tbd tbe tbo tbs tbt tcb tcc tcd tce tco tcs tct tdb tdc tdd tde tdo tds tdt tdy te- teb tec ted tee teo tes tet tey to- tob toc tod toe too tos tot toy tsb tsc tsd tse tso tss tst tsy ttb ttc ttd tte tto tts ttt tty tyc tyd tye tyo tys tyt ybc ybe ybs yby ycc ycd yce yco ycs ycy yde ydo yds ydt ydy yeb yec yed yee yeo yes yet yey yob yoc yod yoe yoo yos yot yoy ysb ysc yse yso yss yst ysy ytc ytd yte yto yts ytt yyb yyc yye yys yyt yyy