a-a a-b a-i a-t aaa aab aad aai aao aar aas aat ab- aba abb abd abi abo abr abs abt ad- ada adb add adi ado adr ads adt ai- aia aib aid aii aio air ais ait aoa aob aod aoi aoo aor aos aot ar- ara arb ard ari aro arr ars art as- asa asb asd asi aso asr ass ast at- ata atb atd ati ato atr ats att baa bab bad bai bao bar bas bat bba bbb bbd bbi bbo bbr bbs bbt bda bdb bdd bdi bdo bdr bds bdt bi- bia bib bid bii bio bir bis bit boa bob bod boi boo bor bos bot bra brb brd bri bro brr brs brt bsa bsb bsd bsi bso bsr bss bst bta btb btd bti bto btr bts btt daa dab dad dai dao dar das dat dba dbb dbd dbi dbo dbr dbs dbt dda ddb ddd ddi ddo ddr dds ddt di- dia dib did dii dio dir dis dit doa dob dod doi doo dor dos dot dra drb drd dri dro drr drs drt dsa dsb dsd dsi dso dsr dss dst dta dtb dtd dti dto dtr dts dtt i-d ia- iaa iab iad iai iao iar ias iat iba ibb ibd ibi ibo ibr ibs ibt ida idb idd idi ido idr ids idt iia iib iid iii iio iir iis iit io- ioa iob iod ioi ioo ior ios iot ir- ira irb ird iri iro irr irs irt is- isa isb isd isi iso isr iss ist ita itb itd iti ito its itt o-i oaa oab oad oai oao oar oas oat ob- oba obb obd obi obo obr obs obt oda odb odd odi odo odr ods odt oia oib oid oii oio oir ois oit oo- ooa oob ood ooi ooo oor oos oot or- ora orb ord ori oro orr ors ort os- osa osb osd osi oso osr oss ost ot- ota otb otd oti oto otr ots ott ra- raa rab rad rai rao rar ras rat rba rbb rbd rbi rbo rbr rbs rbt rda rdb rdd rdi rdo rdr rds rdt ria rib rid rii rio rir ris rit roa rob rod roi roo ror ros rot rra rrb rrd rri rrr rrs rrt rsa rsb rsd rsi rso rsr rss rst rta rtb rtd rti rto rtr rts rtt saa sab sad sai sao sar sas sat sba sbb sbd sbi sbo sbr sbs sbt sda sdb sdd sdi sdo sdr sds sdt sia sib sid sii sio sir sis sit soa sob sod soi soo sor sos sot sr- sra srb srd sri sro srr srs srt ss- ssa ssb ssd ssi sso ssr sss sst sta stb std sti sto str sts stt taa tab tad tai tao tar tas tat tba tbb tbd tbi tbo tbr tbs tbt tda tdb tdd tdi tdo tdr tds tdt tia tib tid tii tio tir tis tit to- toa tob tod toi too tor tos tot tra trb trd tri tro trr trs trt tsa tsb tsd tsi tso tsr tss tst tta ttb ttd tti tto ttr tts ttt