a-a a-b a-t a-z aaa aab aad aar aas aat aaz ab- aba abb abd abr abs abt abz ad- ada adb add adr ads adt adz ar- ara arb ard arr ars art arz as- asa asb asd asr ass ast asz at- ata atb atd atr ats att atz az- aza azb azd azs azt azz baa bab bad bar bas bat baz bba bbb bbd bbr bbs bbt bda bdb bdd bdr bds bdt bdz bra brb brd brr brs brt brz bsa bsb bsd bsr bss bst bta btb btd btr bts btt btz bza bzd bzr bzs bzz daa dab dad dar das dat daz dba dbb dbd dbr dbs dbt dbz dda ddb ddd ddr dds ddt ddz dra drb drd drr drs drt drz dsa dsb dsd dsr dss dst dsz dta dtb dtd dtr dts dtt dtz dza dzb dzd dzr dzs ra- raa rab rad rar ras rat raz rba rbb rbd rbr rbs rbt rda rdb rdd rdr rds rdt rra rrb rrd rrr rrs rrt rsa rsb rsd rsr rss rst rta rtb rtd rtr rts rtt rtz rza rzb saa sab sad sar sas sat saz sba sbb sbd sbr sbs sbt sda sdb sdd sdr sds sdt sdz sr- sra srb srd srr srs srt ss- ssa ssb ssd ssr sss sst ssz sta stb std str sts stt stz sza szd szr taa tab tad tar tas tat taz tba tbb tbd tbr tbs tbt tbz tda tdb tdd tdr tds tdt tra trb trd trr trs trt trz tsa tsb tsd tsr tss tst tta ttb ttd ttr tts ttt tza tzd tzs zaa zab zad zar zas zat zaz zbb zbr zbs zbt zds zdt zrs zsa zst zsz zta ztr zzr zzs zzt zzz