-al -ol a-a a-b aaa aab aad aal aao aax ab- aba abb abd abl abo abx ad- ada adb add adl ado adx al- ala alb ald all alo alx aoa aob aod aol aoo aox ax- axa axl axo axx baa bab bad bal bao bax bba bbb bbd bbl bbo bbx bda bdb bdd bdl bdo bdx bla blb bld bll blo blx boa bob bod bol boo box bxb bxd bxl bxo bxx daa dab dad dal dao dax dba dbb dbd dbl dbo dbx dda ddb ddd ddl ddo ddx dl- dla dlb dld dll dlo dlx doa dob dod dol doo dox dxd dxl dxo dxx la- laa lab lad lal lao lax lba lbb lbd lbl lbo lbx lda ldb ldd ldl ldo lla llb lld lll llo loa lob lod lol loo lox lxd lxo lxx oaa oab oad oal oao oax ob- oba obb obd obl obo obx oda odb odd odl odo ola olb old oll olo oo- ooa oob ood ool ooo oox ox- oxa oxb oxo oxx xaa xad xal xbl xbx xda xdb xla xlb xld xoa xod xoo xox xxl xxo xxx