a-a a-b a-z aaa aab aam aan aao aar aaz ab- aba abb abm abn abo abr abz ama amb amm amn amo amr amz an- ana anb anm ann ano anr anz aoa aob aom aon aoo aor ar- ara arb arm arn aro arr arz az- aza azb azm azn azo azz baa bab bam ban bao bar baz bba bbb bbm bbn bbo bbr bma bmb bmm bmn bmo bmr bmz bna bnb bnn bno bnr bnz boa bob bom bon boo bor boz bra brb brm brn bro brr brz bza bzn bzo bzr bzz m-o m-r maa mab mam man mao mar maz mba mbb mbm mbo mbr mma mmb mmm mmn mmo mmr mmz mna mnb mnm mnn mno mnr mnz moa mob mom mon moo mor moz mra mrb mrm mrn mro mrr mrz mza mzb mzm mzn naa nab nam nan nao nar naz nba nbb nbm nbn nbo nbr nma nmb nmm nmn nmo nmr nmz nna nnb nnm nnn nno nnz no- noa nob nom non noo nor noz nra nrb nrm nrn nro nrr nrz nzb nzo nzz oaa oab oam oan oao oar ob- oba obb obm obn obo obr om- oma omb omm omn omo omr omz on- ona onb onn ono onr oo- ooa oob oom oon ooo oor or- ora orb orm orn oro orr orz oza ozm ozo ozz ra- raa rab ram ran rao rar raz rba rbb rbm rbn rbo rbr rma rmb rmm rmn rmo rmr rna rnb rnm rnn rno rnr rnz roa rob rom ron roo ror roz rra rrb rrm rrn rrr rza rzb rzm rzo zaa zab zam zan zao zar zaz zbb zbm zbr zma zmb zmm znn zno zo- zoa zob zom zon zoo zor zro zzr zzz