-er bbb bbe bbi bbm bbo bbr bbt bbx be- beb bee bei bem beo ber bet bex bi- bib bie bii bim bio bir bit bix bmb bme bmi bmm bmo bmr bmt bmx bob boe boi bom boo bor bot box brb bre bri brm bro brr brt brx btb bte bti btm bto btr btt btx bxb bxi bxm bxo bxx ebb ebe ebi ebm ebo ebr ebt ebx eeb eee eem eeo eer eet eex eib eie eii eim eio eir eit eix em- emb eme emi emm emo emr emt emx eo- eob eoe eoi eom eoo eor eot erb ere eri erm ero err ert etb ete eti etm eto etr ett etx ex- exe exi exo exr ext exx ibb ibe ibi ibm ibo ibr ibt ibx ie- iee iei iem ier iet iex iib iie iii iim iio iir iit iix im- imb ime imi imm imo imt imx io- iob ioe ioi iom ioo ior iot ir- irb ire iri irm iro irr irt irx itb ite iti itm ito itt itx ixe ixi m-o m-r mbb mbe mbi mbm mbo mbr mbt mbx meb mee mei mem meo mer met mex mi- mib mie mii mim mio mir mit mix mmb mme mmi mmm mmo mmr mmt mmx mob moe moi mom moo mor mot mox mrb mre mri mrm mro mrr mrt mrx mtb mte mti mtm mto mtr mtt mtx mxi mxr o-i ob- obb obe obi obm obo obr obt obx oeb oee oei oem oeo oer oet oex oib oie oii oim oio oir oit om- omb ome omi omm omo omr omt omx oo- oob ooi oom ooo oor oot oox or- orb ore ori orm oro orr ort orx ot- otb ote oti otm oto otr ott ox- oxb oxi oxo oxt oxx rbb rbe rbi rbm rbo rbr rbt rbx re- reb ree rei rem reo rer ret rex rib rie rii rim rio rir rit rix rmb rme rmi rmm rmo rmr rmt rmx rob roe roi rom roo ror rot rox rrb rri rrm rrr rrt rtb rte rti rtm rto rtr rtt rtx rxr t-x tbb tbe tbi tbm tbo tbr tbt te- teb tee tei tem teo ter tet tex tib tie tii tim tio tir tit tix tmb tme tmi tmm tmo tmr tmt tmx to- tob toe toi tom too tor tot tox trb tre tri trm tro trr trt trx ttb tte tti ttm tto ttr ttt ttx txe txi txt xbe xbr xbx xee xem xer xet xex xie xii xio xit xix xmi xmm xmo xmr xmt xmx xoi xom xoo xor xot xox xrt xrx xti xtm xtr xtx xxi xxo xxx