-er b-u bbb bbe bbg bbl bbn bbr bbu bbx be- beb bee beg bel ben ber beu bex bgb bge bgg bgl bgn bgr bgu bgx blb ble blg bll bln blr blu blx bnb bne bng bnl bnn bnr bnu bnx brb bre brg brl brn brr bru brx bub bue bug bul bun bur buu bux bxb bxl bxn bxx ebb ebe ebg ebl ebn ebr ebu ebx eeb eee eeg eel een eer eex egb ege egg egl egn egr egu egx elb ele elg ell eln elr elu elx en- enb ene eng enl enn enr enu erb ere erg erl ern err eru eu- eub eue eug eul eun eur eux ex- exe exl exr exu exx gbe gbg gbl gbn gbr gbu gbx ge- geb gee geg gel gen ger geu gex ggb ggg ggn ggr ggu glb gle glg gll gln glr glu glx gnb gne gnl gnn gnr gnu grb gre grg grl grn grr gru grx gu- gub gue gug gul gun gur guu gxl lbb lbe lbg lbl lbr lbu lbx leb lee leg lel len ler leu lex lgb lge lgg lgl lgn lgr lgu llb lle llg lll lln llr llu lnb lne lng lnl lnn lnr lnu lrb lrg lrn lrr lru lub lue lug lul lun lur luu lux lxr lxx nbb nbe nbg nbl nbn nbr nbu nbx ne- neb nee neg nel nen ner neu nex ngb nge ngg ngl ngn ngu nlb nle nlg nll nln nlr nlu nlx nnb nne nng nnl nnn nnu nrb nre nrg nrl nrn nrr nru nrx nub nue nug nul nun nur nuu nux nxl rbb rbe rbg rbl rbn rbr rbu rbx re- reb ree reg rel ren rer reu rex rgb rge rgg rgn rgr rgx rle rlg rll rln rlr rlu rnb rng rnn rnr rnu rrb rrg rrl rrn rrr rru rub rue rug run rur ruu rux rxr ubb ube ubg ubl ubn ubr ubu ubx ueb uee ueg uel uen uer ugb uge ugg ugl ugn ugr ugu ugx ulb ule ulg ull uln ulr ulu un- unb une ung unl unn unr unu unx ur- urb ure urg url urn urr uru urx uue uug uun uur uuu uxb uxr uxu xbe xbl xbr xbx xee xeg xel xen xer xeu xex xge xgl xlb xlg xlr xnu xrx xue xul xun xxl xxx