-th a-a a-b a-t aaa aab aaf aah aao aas aat ab- aba abb abf abh abo abs abt af- afa afb aff afh afo afs aft aha ahb ahf ahh aho ahs aht aoa aob aof aoh aoo aos aot as- asa asb asf ash aso ass ast at- ata atb atf ath ato ats att baa bab baf bah bao bas bat bba bbb bbf bbh bbo bbs bbt bfa bfb bff bfh bfo bfs bft bha bhb bhf bhh bho bhs bht boa bob bof boh boo bos bot bsa bsb bsf bsh bso bss bst bta btb btf bth bto bts btt faa fab faf fah fao fas fat fba fbb fbf fbh fbo fbs fbt ffa fff ffh ffo ffs fft fha fhb fhf fhh fho fhs foa fob fof foh foo fos fot fsa fsb fsf fsh fso fss fst fta ftb ftf fth fto fts ftt haa hab haf hah hao has hat hba hbb hbf hbh hbo hbs hbt hfa hfb hff hfh hfo hfs hft hha hhb hhf hhh hho hhs hht hoa hob hof hoh hoo hos hot hsa hsb hsf hsh hss hst hta htb htf hth hto hts htt oaa oab oaf oah oao oas oat ob- oba obb obf obh obo obs obt of- ofa ofb off ofo ofs oft oha ohf ohh oho ohs oht oo- ooa oob oof ooh ooo oos oot os- osa osb osf osh oso oss ost ot- ota otb otf oth oto ots ott saa sab saf sah sao sas sat sba sbb sbf sbh sbo sbs sbt sfa sfb sff sfh sfo sfs sft sh- sha shb shf shh sho shs sht soa sob sof soh soo sos sot ss- ssa ssb ssf ssh sso sss sst sta stb stf sth sto sts stt taa tab taf tah tao tas tat tba tbb tbf tbh tbo tbs tbt tfa tfb tff tfh tfo tfs tft th- tha thb thf thh tho ths tht to- toa tob tof toh too tos tot tsa tsb tsf tsh tso tss tst tta ttb ttf tth tto tts ttt