a-a a-b a-z aaa aab aad aao aar aau aaz ab- aba abb abd abo abr abu abz ad- ada adb add ado adr adu adz aoa aob aod aoo aor aou ar- ara arb ard aro arr aru arz au- aua aub aud auo aur auz az- aza azb azd azo azu azz b-u baa bab bad bao bar bau baz bba bbb bbd bbo bbr bbu bda bdb bdd bdo bdr bdu bdz boa bob bod boo bor bou boz bra brb brd bro brr bru brz bua bub bud buo bur buu buz bza bzd bzo bzr bzu bzz daa dab dad dao dar dau daz dba dbb dbd dbo dbr dbu dbz dda ddb ddd ddo ddr ddu ddz doa dob dod doo dor dou doz dra drb drd dro drr dru drz dua dub dud duo dur duz dza dzb dzd dzo dzr dzu oaa oab oad oao oar oau ob- oba obb obd obo obr obu oda odb odd odo odr odu oo- ooa oob ood ooo oor or- ora orb ord oro orr oru orz ou- oua oud ouo our oza ozo ozu ozz ra- raa rab rad rao rar rau raz rba rbb rbd rbo rbr rbu rda rdb rdd rdo rdr rdu roa rob rod roo ror rou roz rra rrb rrd rrr rru rua rub rud ruo rur ruu ruz rza rzb rzo ua- uaa uab uad uao uar uau uaz uba ubb ubo ubr ubu uda udb udd udo udr udu uoa uob uod uoo uor ur- ura urb urd uro urr uru urz uua uur uuu uza uzb uzo uzu zaa zab zad zao zar zaz zbb zbr zo- zoa zob zod zoo zor zou zro zub zud zur zuz zzr zzz