-al -ol a-a a-b aaa aab aad aal aao aar ab- aba abb abd abl abo abr ad- ada adb add adl ado adr al- ala alb ald all alo alr aoa aob aod aol aoo aor ar- ara arb ard arl aro arr baa bab bad bal bao bar bba bbb bbd bbl bbo bbr bda bdb bdd bdl bdo bdr bla blb bld bll blo blr boa bob bod bol boo bor bra brb brd brl bro brr daa dab dad dal dao dar dba dbb dbd dbl dbo dbr dda ddb ddd ddl ddo ddr dl- dla dlb dld dll dlo dlr doa dob dod dol doo dor dra drb drd drl dro drr la- laa lab lad lal lao lar lba lbb lbd lbl lbo lbr lda ldb ldd ldl ldo ldr lla llb lld lll llo llr loa lob lod lol loo lor lra lrb lrd lro lrr oaa oab oad oal oao oar ob- oba obb obd obl obo obr oda odb odd odl odo odr ola olb old oll olo oo- ooa oob ood ool ooo oor or- ora orb ord orl oro orr ra- raa rab rad ral rao rar rba rbb rbd rbl rbo rbr rda rdb rdd rdl rdo rdr rla rld rll rlo rlr roa rob rod rol roo ror rra rrb rrd rrl rrr