a-a a-b a-i a-t aaa aab aad aai aao aas aat ab- aba abb abd abi abo abs abt ad- ada adb add adi ado ads adt ai- aia aib aid aii aio ais ait aoa aob aod aoi aoo aos aot as- asa asb asd asi aso ass ast at- ata atb atd ati ato ats att baa bab bad bai bao bas bat bba bbb bbd bbi bbo bbs bbt bda bdb bdd bdi bdo bds bdt bi- bia bib bid bii bio bis bit boa bob bod boi boo bos bot bsa bsb bsd bsi bso bss bst bta btb btd bti bto bts btt daa dab dad dai dao das dat dba dbb dbd dbi dbo dbs dbt dda ddb ddd ddi ddo dds ddt di- dia dib did dii dio dis dit doa dob dod doi doo dos dot dsa dsb dsd dsi dso dss dst dta dtb dtd dti dto dts dtt i-d ia- iaa iab iad iai iao ias iat iba ibb ibd ibi ibo ibs ibt ida idb idd idi ido ids idt iia iib iid iii iio iis iit io- ioa iob iod ioi ioo ios iot is- isa isb isd isi iso iss ist ita itb itd iti ito its itt o-i oaa oab oad oai oao oas oat ob- oba obb obd obi obo obs obt oda odb odd odi odo ods odt oia oib oid oii oio ois oit oo- ooa oob ood ooi ooo oos oot os- osa osb osd osi oso oss ost ot- ota otb otd oti oto ots ott saa sab sad sai sao sas sat sba sbb sbd sbi sbo sbs sbt sda sdb sdd sdi sdo sds sdt sia sib sid sii sio sis sit soa sob sod soi soo sos sot ss- ssa ssb ssd ssi sso sss sst sta stb std sti sto sts stt taa tab tad tai tao tas tat tba tbb tbd tbi tbo tbs tbt tda tdb tdd tdi tdo tds tdt tia tib tid tii tio tis tit to- toa tob tod toi too tos tot tsa tsb tsd tsi tso tss tst tta ttb ttd tti tto tts ttt