-er -ol b-u bbb bbd bbe bbl bbo bbr bbu bdb bdd bde bdl bdo bdr bdu bdv be- beb bed bee bel beo ber beu bev blb bld ble bll blo blr blu blv bob bod boe bol boo bor bou bov brb brd bre brl bro brr bru brv bub bud bue bul buo bur buu bvb bvd bve bvl bvo bvr bvu bvv dbb dbd dbe dbl dbo dbr dbu dbv ddb ddd dde ddl ddo ddr ddu de- deb ded dee del deo der deu dev dl- dlb dld dle dll dlo dlr dlu dlv dob dod doe dol doo dor dou dov drb drd dre drl dro drr dru drv dub dud due dul duo dur duv dvb dvd dve dvl dvr dvu ebb ebd ebe ebl ebo ebr ebu ebv ed- edb edd ede edl edo edr edu eeb eed eee eel eeo eer eev elb eld ele ell elo elr elu elv eo- eob eod eoe eol eoo eor eou erb erd ere erl ero err eru erv eu- eub eud eue eul eur euv evb evd eve evl evo evr evv lbb lbd lbe lbl lbo lbr lbu lbv ldb ldd lde ldl ldo ldr ldu ldv leb led lee lel leo ler leu lev llb lld lle lll llo llr llu llv lob lod loe lol loo lor lou lov lrb lrd lro lrr lru lrv lub lud lue lul luo lur luu luv lvb lvd lve lvl lvr lvv ob- obb obd obe obl obo obr obu obv odb odd ode odl odo odr odu odv oeb oed oee oel oeo oer olb old ole oll olo olu oo- oob ood ool ooo oor oov or- orb ord ore orl oro orr oru orv ou- oud oue oul ouo our ov- ovb ovd ove ovl ovo ovv rbb rbd rbe rbl rbo rbr rbu rdb rdd rde rdl rdo rdr rdu rdv re- reb red ree rel reo rer reu rev rld rle rll rlo rlr rlu rob rod roe rol roo ror rou rov rrb rrd rrl rrr rru rub rud rue ruo rur ruu ruv rvb rvd rve rvl rvo rvr rvu rvv ubb ube ubl ubo ubr ubu ubv udb udd ude udl udo udr udu udv ueb ued uee uel uer ulb uld ule ull ulo ulr ulu ulv uob uod uoe uol uoo uor ur- urb urd ure url uro urr uru uue uur uuu uvb uve uvl uvo uvu uvv v-e vbd vbl vbo vbr vbv vdb vdd vde vdl vdo vdr vdu vdv veb ved vee vel veo ver veu vl- vlb vld vle vll vlo vlv vob vod voe vol voo vor vou vov vrb vrd vre vrr vru vue vul vur vuv vvb vvo vvr vvv