a-a a-b a-i a-t aaa aab aaf aai aan aao aas aat ab- aba abb abf abi abn abo abs abt af- afa afb aff afi afn afo afs aft ai- aia aib aif aii ain aio ais ait an- ana anb anf ani ann ano ans ant aoa aob aof aoi aon aoo aos aot as- asa asb asf asi asn aso ass ast at- ata atb atf ati atn ato ats att baa bab baf bai ban bao bas bat bba bbb bbf bbi bbn bbo bbs bbt bfa bfb bff bfi bfn bfo bfs bft bi- bia bib bif bii bin bio bis bit bna bnb bnf bni bnn bno bns bnt boa bob bof boi bon boo bos bot bsa bsb bsf bsi bsn bso bss bst bta btb btf bti btn bto bts btt faa fab faf fai fan fao fas fat fba fbb fbf fbi fbn fbo fbs fbt ffa fff ffi ffn ffo ffs fft fia fib fif fii fin fis fit fna fnb fnf fni fnn fns fnt foa fob fof foi fon foo fos fot fsa fsb fsf fsi fsn fso fss fst fta ftb ftf fti ftn fto fts ftt i-f ia- iaa iab iaf iai ian iao ias iat iba ibb ibf ibi ibn ibo ibs ibt ifa ifb iff ifi ifn ifo ifs ift iia iib iif iii iin iio iis iit in- ina inb inf ini inn ino ins int io- ioa iob iof ioi ion ioo ios iot is- isa isb isf isi isn iso iss ist ita itb itf iti itn ito its itt n-i naa nab naf nai nan nao nas nat nba nbb nbf nbi nbn nbo nbs nbt nfa nfb nff nfi nfn nfo nfs nft nia nib nif nii nin nio nis nit nna nnb nnf nni nnn nno nns nnt no- noa nob nof noi non noo nos not nsa nsb nsf nsi nsn nso nss nst nta ntb ntf nti ntn nto nts ntt o-i oaa oab oaf oai oan oao oas oat ob- oba obb obf obi obn obo obs obt of- ofa ofb off ofi ofn ofo ofs oft oia oib oif oii oin oio ois oit on- ona onb onf oni onn ono ons ont oo- ooa oob oof ooi oon ooo oos oot os- osa osb osf osi osn oso oss ost ot- ota otb otf oti otn oto ots ott saa sab saf sai san sao sas sat sba sbb sbf sbi sbn sbo sbs sbt sfa sfb sff sfi sfn sfo sfs sft sia sib sif sii sin sio sis sit sna snb snf sni snn sno sns snt soa sob sof soi son soo sos sot ss- ssa ssb ssf ssi ssn sso sss sst sta stb stf sti stn sto sts stt taa tab taf tai tan tao tas tat tba tbb tbf tbi tbn tbo tbs tbt tfa tfb tff tfi tfn tfo tfs tft tia tib tif tii tin tio tis tit tna tnb tnf tni tnn tno tns tnt to- toa tob tof toi ton too tos tot tsa tsb tsf tsi tsn tso tss tst tta ttb ttf tti ttn tto tts ttt