a-a a-b a-i a-t aaa aab aaf aai aan aao aar aas aat ab- aba abb abf abi abn abo abr abs abt af- afa afb aff afi afn afo afr afs aft ai- aia aib aif aii ain aio air ais ait an- ana anb anf ani ann ano anr ans ant aoa aob aof aoi aon aoo aor aos aot ar- ara arb arf ari arn aro arr ars art as- asa asb asf asi asn aso asr ass ast at- ata atb atf ati atn ato atr ats att baa bab baf bai ban bao bar bas bat bba bbb bbf bbi bbn bbo bbr bbs bbt bfa bfb bff bfi bfn bfo bfr bfs bft bi- bia bib bif bii bin bio bir bis bit bna bnb bnf bni bnn bno bnr bns bnt boa bob bof boi bon boo bor bos bot bra brb brf bri brn bro brr brs brt bsa bsb bsf bsi bsn bso bsr bss bst bta btb btf bti btn bto btr bts btt faa fab faf fai fan fao far fas fat fba fbb fbf fbi fbn fbo fbr fbs fbt ffa fff ffi ffn ffo ffr ffs fft fia fib fif fii fin fir fis fit fna fnb fnf fni fnn fnr fns fnt foa fob fof foi fon foo for fos fot fra frb frf fri frn fro frr frs frt fsa fsb fsf fsi fsn fso fsr fss fst fta ftb ftf fti ftn fto ftr fts ftt i-f ia- iaa iab iaf iai ian iao iar ias iat iba ibb ibf ibi ibn ibo ibr ibs ibt ifa ifb iff ifi ifn ifo ifr ifs ift iia iib iif iii iin iio iir iis iit in- ina inb inf ini inn ino inr ins int io- ioa iob iof ioi ion ioo ior ios iot ir- ira irb irf iri irn iro irr irs irt is- isa isb isf isi isn iso isr iss ist ita itb itf iti itn ito its itt n-i naa nab naf nai nan nao nar nas nat nba nbb nbf nbi nbn nbo nbr nbs nbt nfa nfb nff nfi nfn nfo nfr nfs nft nia nib nif nii nin nio nir nis nit nna nnb nnf nni nnn nno nns nnt no- noa nob nof noi non noo nor nos not nra nrb nrf nri nrn nro nrr nrs nrt nsa nsb nsf nsi nsn nso nsr nss nst nta ntb ntf nti ntn nto ntr nts ntt o-i oaa oab oaf oai oan oao oar oas oat ob- oba obb obf obi obn obo obr obs obt of- ofa ofb off ofi ofn ofo ofr ofs oft oia oib oif oii oin oio oir ois oit on- ona onb onf oni onn ono onr ons ont oo- ooa oob oof ooi oon ooo oor oos oot or- ora orb orf ori orn oro orr ors ort os- osa osb osf osi osn oso osr oss ost ot- ota otb otf oti otn oto otr ots ott ra- raa rab raf rai ran rao rar ras rat rba rbb rbf rbi rbn rbo rbr rbs rbt rfa rfb rff rfi rfn rfo rfr rfs rft ria rib rif rii rin rio rir ris rit rna rnb rni rnn rno rnr rns rnt roa rob rof roi ron roo ror ros rot rra rrb rrf rri rrn rrr rrs rrt rsa rsb rsf rsi rsn rso rsr rss rst rta rtb rtf rti rtn rto rtr rts rtt saa sab saf sai san sao sar sas sat sba sbb sbf sbi sbn sbo sbr sbs sbt sfa sfb sff sfi sfn sfo sfr sfs sft sia sib sif sii sin sio sir sis sit sna snb snf sni snn sno snr sns snt soa sob sof soi son soo sor sos sot sr- sra srb srf sri srn sro srr srs srt ss- ssa ssb ssf ssi ssn sso ssr sss sst sta stb stf sti stn sto str sts stt taa tab taf tai tan tao tar tas tat tba tbb tbf tbi tbn tbo tbr tbs tbt tfa tfb tff tfi tfn tfo tfr tfs tft tia tib tif tii tin tio tir tis tit tna tnb tnf tni tnn tno tnr tns tnt to- toa tob tof toi ton too tor tos tot tra trb trf tri trn tro trr trs trt tsa tsb tsf tsi tsn tso tsr tss tst tta ttb ttf tti ttn tto ttr tts ttt