-er -ol bbb bbe bbi bbl bbo bbr bbt bbx be- beb bee bei bel beo ber bet bex bi- bib bie bii bil bio bir bit bix blb ble bli bll blo blr blt blx bob boe boi bol boo bor bot box brb bre bri brl bro brr brt brx btb bte bti btl bto btr btt btx bxb bxi bxl bxo bxx ebb ebe ebi ebl ebo ebr ebt ebx eeb eee eel eeo eer eet eex eib eie eii eil eio eir eit eix elb ele eli ell elo elr elt elx eo- eob eoe eoi eol eoo eor eot erb ere eri erl ero err ert etb ete eti etl eto etr ett etx ex- exe exi exl exo exr ext exx ibb ibe ibi ibl ibo ibr ibt ibx ie- iee iei iel ier iet iex iib iie iii iil iio iir iit iix il- ilb ile ili ill ilo ilr ilt ilx io- iob ioe ioi iol ioo ior iot ir- irb ire iri irl iro irr irt irx itb ite iti itl ito itt itx ixe ixi ixl lbb lbe lbi lbl lbo lbr lbt lbx leb lee lei lel leo ler let lex lib lie lii lil lio lir lit lix llb lle lli lll llo llr llt lob loe loi lol loo lor lot lox lrb lri lro lrr lrt ltb lte lti ltl lto ltr ltt ltx lxi lxo lxr lxx o-i ob- obb obe obi obl obo obr obt obx oeb oee oei oel oeo oer oet oex oib oie oii oil oio oir oit olb ole oli oll olo olt oo- oob ooi ool ooo oor oot oox or- orb ore ori orl oro orr ort orx ot- otb ote oti otl oto otr ott ox- oxb oxi oxo oxt oxx rbb rbe rbi rbl rbo rbr rbt rbx re- reb ree rei rel reo rer ret rex rib rie rii ril rio rir rit rix rle rli rll rlo rlr rlt rob roe roi rol roo ror rot rox rrb rri rrl rrr rrt rtb rte rti rtl rto rtr rtt rtx rxr t-x tbb tbe tbi tbl tbo tbr tbt te- teb tee tei tel teo ter tet tex tib tie tii til tio tir tit tix tle tli tll tlo tlr tlt tlx to- tob toe toi tol too tor tot tox trb tre tri trl tro trr trt trx ttb tte tti ttl tto ttr ttt ttx txe txi txl txt xbe xbl xbr xbx xee xel xer xet xex xie xii xio xit xix xlb xli xlr xlt xoi xoo xor xot xox xrt xrx xti xtr xtx xxi xxl xxo xxx