-er -ol bbb bbe bbl bbo bbr bbt bbx be- beb bee bel beo ber bet bex blb ble bll blo blr blt blx bob boe bol boo bor bot box brb bre brl bro brr brt brx btb bte btl bto btr btt btx bxb bxl bxo bxx ebb ebe ebl ebo ebr ebt ebx eeb eee eel eeo eer eet eex elb ele ell elo elr elt elx eo- eob eoe eol eoo eor eot erb ere erl ero err ert etb ete etl eto etr ett etx ex- exe exl exo exr ext exx lbb lbe lbl lbo lbr lbt lbx leb lee lel leo ler let lex llb lle lll llo llr llt lob loe lol loo lor lot lox lrb lro lrr lrt ltb lte ltl lto ltr ltt ltx lxo lxr lxx ob- obb obe obl obo obr obt obx oeb oee oel oeo oer oet oex olb ole oll olo olt oo- oob ool ooo oor oot oox or- orb ore orl oro orr ort orx ot- otb ote otl oto otr ott ox- oxb oxo oxt oxx rbb rbe rbl rbo rbr rbt rbx re- reb ree rel reo rer ret rex rle rll rlo rlr rlt rob roe rol roo ror rot rox rrb rrl rrr rrt rtb rte rtl rto rtr rtt rtx rxr t-x tbb tbe tbl tbo tbr tbt te- teb tee tel teo ter tet tex tle tll tlo tlr tlt tlx to- tob toe tol too tor tot tox trb tre trl tro trr trt trx ttb tte ttl tto ttr ttt ttx txe txl txt xbe xbl xbr xbx xee xel xer xet xex xlb xlr xlt xoo xor xot xox xrt xrx xtr xtx xxl xxo xxx