-ey bbb bbe bbo bbt bbx bby be- beb bee beo bet bex bey bob boe boo bot box boy btb bte bto btt btx bty bxb bxo bxx by- bye byo byt ebb ebe ebo ebt ebx eby eeb eee eeo eet eex eey eo- eob eoe eoo eot etb ete eto ett etx ety ex- exe exo ext exx exy eye eyo eyt ob- obb obe obo obt obx oby oeb oee oeo oet oex oey oo- oob ooo oot oox ot- otb ote oto ott ox- oxb oxo oxt oxx oxy oye oyo t-x tbb tbe tbo tbt te- teb tee teo tet tex tey to- tob toe too tot tox toy ttb tte tto ttt ttx tty txe txt tye tyo tyt xbe xbx xee xet xex xoo xot xox xtx xty xxo xxx xxy xyy ybe yby yeb yee yeo yet yex yey yob yoe yoo yot yox yoy yte yto ytt yxe yxy yyb yye yyt yyy