-er -ol b-u bbb bbe bbf bbl bbo bbr bbu be- beb bee bef bel beo ber beu bfb bfe bff bfl bfo bfr bfu blb ble blf bll blo blr blu bob boe bof bol boo bor bou brb bre brf brl bro brr bru bub bue buf bul buo bur buu ebb ebe ebf ebl ebo ebr ebu eeb eee eef eel eeo eer ef- efb efe eff efl efo efr elb ele elf ell elo elr elu eo- eob eoe eof eol eoo eor eou erb ere erf erl ero err eru eu- eub eue euf eul eur fbb fbe fbf fbl fbo fbr fbu feb fee fef fel feo fer feu ffe fff ffl ffo ffr ffu flb fle flf fll flo flr flu fob foe fof fol foo for fou frb fre frf frl fro frr fru fub fue fuf ful fuo fur fuu lbb lbe lbf lbl lbo lbr lbu leb lee lef lel leo ler leu lfb lfe lff lfl lfo lfr lfu llb lle llf lll llo llr llu lob loe lof lol loo lor lou lrb lrf lro lrr lru lub lue luf lul luo lur luu ob- obb obe obf obl obo obr obu oeb oee oef oel oeo oer of- ofb ofe off ofl ofo ofr ofu olb ole olf oll olo olu oo- oob oof ool ooo oor or- orb ore orf orl oro orr oru ou- oue ouf oul ouo our rbb rbe rbf rbl rbo rbr rbu re- reb ree ref rel reo rer reu rfb rfe rff rfl rfo rfr rfu rle rlf rll rlo rlr rlu rob roe rof rol roo ror rou rrb rrf rrl rrr rru rub rue ruf ruo rur ruu ubb ube ubf ubl ubo ubr ubu ueb uee uef uel uer ufe uff ufl ufo ufr ufu ulb ule ulf ull ulo ulr ulu uob uoe uol uoo uor ur- urb ure urf url uro urr uru uue uur uuu