-al -ol a-a a-b aaa aab aad aaf aal aao aau ab- aba abb abd abf abl abo abu ad- ada adb add adf adl ado adu af- afa afb afd aff afl afo afu al- ala alb ald alf all alo alu aoa aob aod aof aol aoo aou au- aua aub aud auf aul auo b-u baa bab bad baf bal bao bau bba bbb bbd bbf bbl bbo bbu bda bdb bdd bdf bdl bdo bdu bfa bfb bfd bff bfl bfo bfu bla blb bld blf bll blo blu boa bob bod bof bol boo bou bua bub bud buf bul buo buu daa dab dad daf dal dao dau dba dbb dbd dbf dbl dbo dbu dda ddb ddd ddf ddl ddo ddu dfa dfb dfd dff dfl dfo dfu dl- dla dlb dld dlf dll dlo dlu doa dob dod dof dol doo dou dua dub dud duf dul duo faa fab fad faf fal fao fau fba fbb fbd fbf fbl fbo fbu fda fdb fdd fdf fdl fdo fdu ffa ffd fff ffl ffo ffu fla flb fld flf fll flo flu foa fob fof fol foo fou fua fub fud fuf ful fuo fuu la- laa lab lad laf lal lao lau lba lbb lbd lbf lbl lbo lbu lda ldb ldd ldf ldl ldo ldu lfa lfb lfd lff lfl lfo lfu lla llb lld llf lll llo llu loa lob lod lof lol loo lou lua lub lud luf lul luo luu oaa oab oad oaf oal oao oau ob- oba obb obd obf obl obo obu oda odb odd odf odl odo odu of- ofa ofb ofd off ofl ofo ofu ola olb old olf oll olo olu oo- ooa oob ood oof ool ooo ou- oua oud ouf oul ouo ua- uaa uab uad uaf ual uao uau uba ubb ubf ubl ubo ubu uda udb udd udf udl udo udu ufa ufd uff ufl ufo ufu ula ulb uld ulf ull ulo ulu uoa uob uod uol uoo uua uuu