-al -ol a-a a-b aaa aab aad aal aao aas ab- aba abb abd abl abo abs ad- ada adb add adl ado ads al- ala alb ald all alo als aoa aob aod aol aoo aos as- asa asb asd asl aso ass baa bab bad bal bao bas bba bbb bbd bbl bbo bbs bda bdb bdd bdl bdo bds bla blb bld bll blo bls boa bob bod bol boo bos bsa bsb bsd bsl bso bss daa dab dad dal dao das dba dbb dbd dbl dbo dbs dda ddb ddd ddl ddo dds dl- dla dlb dld dll dlo dls doa dob dod dol doo dos dsa dsb dsd dsl dso dss la- laa lab lad lal lao las lba lbb lbd lbl lbo lbs lda ldb ldd ldl ldo lds lla llb lld lll llo lls loa lob lod lol loo los lsa lsb lsd lsl lso lss oaa oab oad oal oao oas ob- oba obb obd obl obo obs oda odb odd odl odo ods ola olb old oll olo ols oo- ooa oob ood ool ooo oos os- osa osb osd osl oso oss saa sab sad sal sao sas sba sbb sbd sbl sbo sbs sda sdb sdd sdl sdo sds sla slb sld sll slo sls soa sob sod sol soo sos ss- ssa ssb ssd ssl sso sss