-ey bbb bbc bbd bbe bbo bbt bby bcb bcc bcd bce bco bct bcy bdb bdc bdd bde bdo bdt bdy be- beb bec bed bee beo bet bey bob boc bod boe boo bot boy btb btc btd bte bto btt bty by- byc byd bye byo byt c-- cbb cbc cbd cbe cbo cbt cby ccb ccc ccd cce cco cct cdb cdc cdd cde cdo cdt cdy ce- ceb cec ced cee ceo cet cey co- cob coc cod coe coo cot coy ctb ctc ctd cte cto ctt cty cyb cyc cyd cye cyo cyt dbb dbc dbd dbe dbo dbt dby dcb dcc dcd dce dco dct ddb ddc ddd dde ddo ddt ddy de- deb dec ded dee deo det dey dob doc dod doe doo dot doy dtb dtc dtd dte dto dtt dty dy- dyb dyc dyd dye dyo dyy ebb ebc ebd ebe ebo ebt eby ec- ecb ecc ecd ece eco ect ed- edb edc edd ede edo edt edy eeb eec eed eee eeo eet eey eo- eob eoc eod eoe eoo eot etb etc etd ete eto ett ety eyc eyd eye eyo eyt ob- obb obc obd obe obo obt oby oc- ocb occ ocd oco oct odb odc odd ode odo odt oeb oec oed oee oeo oet oey oo- oob ooc ood ooo oot ot- otb otc otd ote oto ott oyd oye oyo tbb tbc tbd tbe tbo tbt tcb tcc tcd tce tco tct tdb tdc tdd tde tdo tdt tdy te- teb tec ted tee teo tet tey to- tob toc tod toe too tot toy ttb ttc ttd tte tto ttt tty tyc tyd tye tyo tyt ybc ybe yby ycc ycd yce yco ycy yde ydo ydt ydy yeb yec yed yee yeo yet yey yob yoc yod yoe yoo yot yoy ytc ytd yte yto ytt yyb yyc yye yyt yyy