a-a a-b a-i a-t aaa aab aad aai aar aas aat ab- aba abb abd abi abr abs abt ad- ada adb add adi adr ads adt ai- aia aib aid aii air ais ait ar- ara arb ard ari arr ars art as- asa asb asd asi asr ass ast at- ata atb atd ati atr ats att baa bab bad bai bar bas bat bba bbb bbd bbi bbr bbs bbt bda bdb bdd bdi bdr bds bdt bi- bia bib bid bii bir bis bit bra brb brd bri brr brs brt bsa bsb bsd bsi bsr bss bst bta btb btd bti btr bts btt daa dab dad dai dar das dat dba dbb dbd dbi dbr dbs dbt dda ddb ddd ddi ddr dds ddt di- dia dib did dii dir dis dit dra drb drd dri drr drs drt dsa dsb dsd dsi dsr dss dst dta dtb dtd dti dtr dts dtt i-d ia- iaa iab iad iai iar ias iat iba ibb ibd ibi ibr ibs ibt ida idb idd idi idr ids idt iia iib iid iii iir iis iit ir- ira irb ird iri irr irs irt is- isa isb isd isi isr iss ist ita itb itd iti its itt ra- raa rab rad rai rar ras rat rba rbb rbd rbi rbr rbs rbt rda rdb rdd rdi rdr rds rdt ria rib rid rii rir ris rit rra rrb rrd rri rrr rrs rrt rsa rsb rsd rsi rsr rss rst rta rtb rtd rti rtr rts rtt saa sab sad sai sar sas sat sba sbb sbd sbi sbr sbs sbt sda sdb sdd sdi sdr sds sdt sia sib sid sii sir sis sit sr- sra srb srd sri srr srs srt ss- ssa ssb ssd ssi ssr sss sst sta stb std sti str sts stt taa tab tad tai tar tas tat tba tbb tbd tbi tbr tbs tbt tda tdb tdd tdi tdr tds tdt tia tib tid tii tir tis tit tra trb trd tri trr trs trt tsa tsb tsd tsi tsr tss tst tta ttb ttd tti ttr tts ttt