-al -ol a-a a-b aaa aab aad aal aao aar aas ab- aba abb abd abl abo abr abs ad- ada adb add adl ado adr ads al- ala alb ald all alo alr als aoa aob aod aol aoo aor aos ar- ara arb ard arl aro arr ars as- asa asb asd asl aso asr ass baa bab bad bal bao bar bas bba bbb bbd bbl bbo bbr bbs bda bdb bdd bdl bdo bdr bds bla blb bld bll blo blr bls boa bob bod bol boo bor bos bra brb brd brl bro brr brs bsa bsb bsd bsl bso bsr bss daa dab dad dal dao dar das dba dbb dbd dbl dbo dbr dbs dda ddb ddd ddl ddo ddr dds dl- dla dlb dld dll dlo dlr dls doa dob dod dol doo dor dos dra drb drd drl dro drr drs dsa dsb dsd dsl dso dsr dss la- laa lab lad lal lao lar las lba lbb lbd lbl lbo lbr lbs lda ldb ldd ldl ldo ldr lds lla llb lld lll llo llr lls loa lob lod lol loo lor los lra lrb lrd lro lrr lrs lsa lsb lsd lsl lso lsr lss oaa oab oad oal oao oar oas ob- oba obb obd obl obo obr obs oda odb odd odl odo odr ods ola olb old oll olo ols oo- ooa oob ood ool ooo oor oos or- ora orb ord orl oro orr ors os- osa osb osd osl oso osr oss ra- raa rab rad ral rao rar ras rba rbb rbd rbl rbo rbr rbs rda rdb rdd rdl rdo rdr rds rla rld rll rlo rlr rls roa rob rod rol roo ror ros rra rrb rrd rrl rrr rrs rsa rsb rsd rsl rso rsr rss saa sab sad sal sao sar sas sba sbb sbd sbl sbo sbr sbs sda sdb sdd sdl sdo sdr sds sla slb sld sll slo slr sls soa sob sod sol soo sor sos sr- sra srb srd srl sro srr srs ss- ssa ssb ssd ssl sso ssr sss