a-a a-b a-i a-t aaa aab aai aan aar aas aat ab- aba abb abi abn abr abs abt ai- aia aib aii ain air ais ait an- ana anb ani ann anr ans ant ar- ara arb ari arn arr ars art as- asa asb asi asn asr ass ast at- ata atb ati atn atr ats att baa bab bai ban bar bas bat bba bbb bbi bbn bbr bbs bbt bi- bia bib bii bin bir bis bit bna bnb bni bnn bnr bns bnt bra brb bri brn brr brs brt bsa bsb bsi bsn bsr bss bst bta btb bti btn btr bts btt ia- iaa iab iai ian iar ias iat iba ibb ibi ibn ibr ibs ibt iia iib iii iin iir iis iit in- ina inb ini inn inr ins int ir- ira irb iri irn irr irs irt is- isa isb isi isn isr iss ist ita itb iti itn its itt n-i naa nab nai nan nar nas nat nba nbb nbi nbn nbr nbs nbt nia nib nii nin nir nis nit nna nnb nni nnn nns nnt nra nrb nri nrn nrr nrs nrt nsa nsb nsi nsn nsr nss nst nta ntb nti ntn ntr nts ntt ra- raa rab rai ran rar ras rat rba rbb rbi rbn rbr rbs rbt ria rib rii rin rir ris rit rna rnb rni rnn rnr rns rnt rra rrb rri rrn rrr rrs rrt rsa rsb rsi rsn rsr rss rst rta rtb rti rtn rtr rts rtt saa sab sai san sar sas sat sba sbb sbi sbn sbr sbs sbt sia sib sii sin sir sis sit sna snb sni snn snr sns snt sr- sra srb sri srn srr srs srt ss- ssa ssb ssi ssn ssr sss sst sta stb sti stn str sts stt taa tab tai tan tar tas tat tba tbb tbi tbn tbr tbs tbt tia tib tii tin tir tis tit tna tnb tni tnn tnr tns tnt tra trb tri trn trr trs trt tsa tsb tsi tsn tsr tss tst tta ttb tti ttn ttr tts ttt