a-a a-b a-i a-t aaa aab aaf aai aan aar aas aat ab- aba abb abf abi abn abr abs abt af- afa afb aff afi afn afr afs aft ai- aia aib aif aii ain air ais ait an- ana anb anf ani ann anr ans ant ar- ara arb arf ari arn arr ars art as- asa asb asf asi asn asr ass ast at- ata atb atf ati atn atr ats att baa bab baf bai ban bar bas bat bba bbb bbf bbi bbn bbr bbs bbt bfa bfb bff bfi bfn bfr bfs bft bi- bia bib bif bii bin bir bis bit bna bnb bnf bni bnn bnr bns bnt bra brb brf bri brn brr brs brt bsa bsb bsf bsi bsn bsr bss bst bta btb btf bti btn btr bts btt faa fab faf fai fan far fas fat fba fbb fbf fbi fbn fbr fbs fbt ffa fff ffi ffn ffr ffs fft fia fib fif fii fin fir fis fit fna fnb fnf fni fnn fnr fns fnt fra frb frf fri frn frr frs frt fsa fsb fsf fsi fsn fsr fss fst fta ftb ftf fti ftn ftr fts ftt i-f ia- iaa iab iaf iai ian iar ias iat iba ibb ibf ibi ibn ibr ibs ibt ifa ifb iff ifi ifn ifr ifs ift iia iib iif iii iin iir iis iit in- ina inb inf ini inn inr ins int ir- ira irb irf iri irn irr irs irt is- isa isb isf isi isn isr iss ist ita itb itf iti itn its itt n-i naa nab naf nai nan nar nas nat nba nbb nbf nbi nbn nbr nbs nbt nfa nfb nff nfi nfn nfr nfs nft nia nib nif nii nin nir nis nit nna nnb nnf nni nnn nns nnt nra nrb nrf nri nrn nrr nrs nrt nsa nsb nsf nsi nsn nsr nss nst nta ntb ntf nti ntn ntr nts ntt ra- raa rab raf rai ran rar ras rat rba rbb rbf rbi rbn rbr rbs rbt rfa rfb rff rfi rfn rfr rfs rft ria rib rif rii rin rir ris rit rna rnb rni rnn rnr rns rnt rra rrb rrf rri rrn rrr rrs rrt rsa rsb rsf rsi rsn rsr rss rst rta rtb rtf rti rtn rtr rts rtt saa sab saf sai san sar sas sat sba sbb sbf sbi sbn sbr sbs sbt sfa sfb sff sfi sfn sfr sfs sft sia sib sif sii sin sir sis sit sna snb snf sni snn snr sns snt sr- sra srb srf sri srn srr srs srt ss- ssa ssb ssf ssi ssn ssr sss sst sta stb stf sti stn str sts stt taa tab taf tai tan tar tas tat tba tbb tbf tbi tbn tbr tbs tbt tfa tfb tff tfi tfn tfr tfs tft tia tib tif tii tin tir tis tit tna tnb tnf tni tnn tnr tns tnt tra trb trf tri trn trr trs trt tsa tsb tsf tsi tsn tsr tss tst tta ttb ttf tti ttn ttr tts ttt