a-a a-b a-z aaa aab aam aao aar aas aaz ab- aba abb abm abo abr abs abz ama amb amm amo amr ams amz aoa aob aom aoo aor aos ar- ara arb arm aro arr ars arz as- asa asb asm aso asr ass asz az- aza azb azm azo azs azz baa bab bam bao bar bas baz bba bbb bbm bbo bbr bbs bma bmb bmm bmo bmr bms bmz boa bob bom boo bor bos boz bra brb brm bro brr brs brz bsa bsb bsm bso bsr bss bza bzo bzr bzs bzz m-o m-r maa mab mam mao mar mas maz mba mbb mbm mbo mbr mbs mma mmb mmm mmo mmr mms mmz moa mob mom moo mor mos moz mra mrb mrm mro mrr mrs mrz msa msb msm mso msr mss mza mzb mzm oaa oab oam oao oar oas ob- oba obb obm obo obr obs om- oma omb omm omo omr oms omz oo- ooa oob oom ooo oor oos or- ora orb orm oro orr ors orz os- osa osb osm oso osr oss oza ozm ozo ozs ozz ra- raa rab ram rao rar ras raz rba rbb rbm rbo rbr rbs rma rmb rmm rmo rmr rms roa rob rom roo ror ros roz rra rrb rrm rrr rrs rsa rsb rsm rso rsr rss rza rzb rzm rzo saa sab sam sao sar sas saz sba sbb sbm sbo sbr sbs sma smb smm smo smr sms smz soa sob som soo sor sos soz sr- sra srb srm sro srr srs ss- ssa ssb ssm sso ssr sss ssz sza szr zaa zab zam zao zar zas zaz zbb zbm zbr zbs zma zmb zmm zms zo- zoa zob zom zoo zor zos zro zrs zsa zsm zsz zzr zzs zzz