-al -ol a-a a-b aaa aab aad aal aao aar aau ab- aba abb abd abl abo abr abu ad- ada adb add adl ado adr adu al- ala alb ald all alo alr alu aoa aob aod aol aoo aor aou ar- ara arb ard arl aro arr aru au- aua aub aud aul auo aur b-u baa bab bad bal bao bar bau bba bbb bbd bbl bbo bbr bbu bda bdb bdd bdl bdo bdr bdu bla blb bld bll blo blr blu boa bob bod bol boo bor bou bra brb brd brl bro brr bru bua bub bud bul buo bur buu daa dab dad dal dao dar dau dba dbb dbd dbl dbo dbr dbu dda ddb ddd ddl ddo ddr ddu dl- dla dlb dld dll dlo dlr dlu doa dob dod dol doo dor dou dra drb drd drl dro drr dru dua dub dud dul duo dur la- laa lab lad lal lao lar lau lba lbb lbd lbl lbo lbr lbu lda ldb ldd ldl ldo ldr ldu lla llb lld lll llo llr llu loa lob lod lol loo lor lou lra lrb lrd lro lrr lru lua lub lud lul luo lur luu oaa oab oad oal oao oar oau ob- oba obb obd obl obo obr obu oda odb odd odl odo odr odu ola olb old oll olo olu oo- ooa oob ood ool ooo oor or- ora orb ord orl oro orr oru ou- oua oud oul ouo our ra- raa rab rad ral rao rar rau rba rbb rbd rbl rbo rbr rbu rda rdb rdd rdl rdo rdr rdu rla rld rll rlo rlr rlu roa rob rod rol roo ror rou rra rrb rrd rrl rrr rru rua rub rud ruo rur ruu ua- uaa uab uad ual uao uar uau uba ubb ubl ubo ubr ubu uda udb udd udl udo udr udu ula ulb uld ull ulo ulr ulu uoa uob uod uol uoo uor ur- ura urb urd url uro urr uru uua uur uuu