a-a a-b a-z aaa aab aam aao aar aau aaz ab- aba abb abm abo abr abu abz ama amb amm amo amr amu amz aoa aob aom aoo aor aou ar- ara arb arm aro arr aru arz au- aua aub aum auo aur auz az- aza azb azm azo azu azz b-u baa bab bam bao bar bau baz bba bbb bbm bbo bbr bbu bma bmb bmm bmo bmr bmu bmz boa bob bom boo bor bou boz bra brb brm bro brr bru brz bua bub bum buo bur buu buz bza bzo bzr bzu bzz m-o m-r maa mab mam mao mar mau maz mba mbb mbm mbo mbr mbu mma mmb mmm mmo mmr mmu mmz moa mob mom moo mor mou moz mra mrb mrm mro mrr mru mrz mua mub mum mur muu mza mzb mzm oaa oab oam oao oar oau ob- oba obb obm obo obr obu om- oma omb omm omo omr omu omz oo- ooa oob oom ooo oor or- ora orb orm oro orr oru orz ou- oua oum ouo our oza ozm ozo ozu ozz ra- raa rab ram rao rar rau raz rba rbb rbm rbo rbr rbu rma rmb rmm rmo rmr roa rob rom roo ror rou roz rra rrb rrm rrr rru rua rub rum ruo rur ruu ruz rza rzb rzm rzo ua- uaa uab uam uao uar uau uaz uba ubb ubo ubr ubu um- uma umb umm umo umr umu uoa uob uom uoo uor ur- ura urb urm uro urr uru urz uua uum uur uuu uza uzb uzo uzu zaa zab zam zao zar zaz zbb zbm zbr zma zmb zmm zo- zoa zob zom zoo zor zou zro zub zum zur zuz zzr zzz