-er b-u bbb bbe bbi bbm bbo bbr bbu bbx be- beb bee bei bem beo ber beu bex bi- bib bie bii bim bio bir biu bix bmb bme bmi bmm bmo bmr bmu bmx bob boe boi bom boo bor bou box brb bre bri brm bro brr bru brx bub bue bui bum buo bur buu bux bxb bxi bxm bxo bxx ebb ebe ebi ebm ebo ebr ebu ebx eeb eee eem eeo eer eex eib eie eii eim eio eir eiu eix em- emb eme emi emm emo emr emu emx eo- eob eoe eoi eom eoo eor eou erb ere eri erm ero err eru eu- eub eue eui eur eux ex- exe exi exo exr exu exx ibb ibe ibi ibm ibo ibr ibu ibx ie- iee iei iem ier iex iib iie iii iim iio iir iiu iix im- imb ime imi imm imo imu imx io- iob ioe ioi iom ioo ior iou ir- irb ire iri irm iro irr iru irx iu- iub iue iui ium iur ixe ixi m-o m-r mbb mbe mbi mbm mbo mbr mbu mbx meb mee mei mem meo mer meu mex mi- mib mie mii mim mio mir miu mix mmb mme mmi mmm mmo mmr mmu mmx mob moe moi mom moo mor mou mox mrb mre mri mrm mro mrr mru mrx mub mue mui mum mur muu mux mxi mxr mxu o-i ob- obb obe obi obm obo obr obu obx oeb oee oei oem oeo oer oex oib oie oii oim oio oir oiu om- omb ome omi omm omo omr omu omx oo- oob ooi oom ooo oor oox or- orb ore ori orm oro orr oru orx ou- oue oui oum ouo our ox- oxb oxi oxo oxx rbb rbe rbi rbm rbo rbr rbu rbx re- reb ree rei rem reo rer reu rex rib rie rii rim rio rir rix rmb rme rmi rmm rmo rmr rmx rob roe roi rom roo ror rou rox rrb rri rrm rrr rru rub rue rui rum ruo rur ruu rux rxr ubb ube ubi ubo ubr ubu ubx ueb uee uei uem uer uib uie uii uim uio uir uiu um- umb ume umi umm umo umr umu uob uoe uom uoo uor uox ur- urb ure uri urm uro urr uru urx uue uum uur uuu uxb uxo uxr uxu xbe xbr xbx xee xem xer xeu xex xie xii xio xiu xix xmi xmm xmo xmr xmu xmx xoi xom xoo xor xox xrx xue xui xxi xxo xxx