a-a a-b a-i a-t aaa aab aai aan aao aar aas aat ab- aba abb abi abn abo abr abs abt ai- aia aib aii ain aio air ais ait an- ana anb ani ann ano anr ans ant aoa aob aoi aon aoo aor aos aot ar- ara arb ari arn aro arr ars art as- asa asb asi asn aso asr ass ast at- ata atb ati atn ato atr ats att baa bab bai ban bao bar bas bat bba bbb bbi bbn bbo bbr bbs bbt bi- bia bib bii bin bio bir bis bit bna bnb bni bnn bno bnr bns bnt boa bob boi bon boo bor bos bot bra brb bri brn bro brr brs brt bsa bsb bsi bsn bso bsr bss bst bta btb bti btn bto btr bts btt ia- iaa iab iai ian iao iar ias iat iba ibb ibi ibn ibo ibr ibs ibt iia iib iii iin iio iir iis iit in- ina inb ini inn ino inr ins int io- ioa iob ioi ion ioo ior ios iot ir- ira irb iri irn iro irr irs irt is- isa isb isi isn iso isr iss ist ita itb iti itn ito its itt n-i naa nab nai nan nao nar nas nat nba nbb nbi nbn nbo nbr nbs nbt nia nib nii nin nio nir nis nit nna nnb nni nnn nno nns nnt no- noa nob noi non noo nor nos not nra nrb nri nrn nro nrr nrs nrt nsa nsb nsi nsn nso nsr nss nst nta ntb nti ntn nto ntr nts ntt o-i oaa oab oai oan oao oar oas oat ob- oba obb obi obn obo obr obs obt oia oib oii oin oio oir ois oit on- ona onb oni onn ono onr ons ont oo- ooa oob ooi oon ooo oor oos oot or- ora orb ori orn oro orr ors ort os- osa osb osi osn oso osr oss ost ot- ota otb oti otn oto otr ots ott ra- raa rab rai ran rao rar ras rat rba rbb rbi rbn rbo rbr rbs rbt ria rib rii rin rio rir ris rit rna rnb rni rnn rno rnr rns rnt roa rob roi ron roo ror ros rot rra rrb rri rrn rrr rrs rrt rsa rsb rsi rsn rso rsr rss rst rta rtb rti rtn rto rtr rts rtt saa sab sai san sao sar sas sat sba sbb sbi sbn sbo sbr sbs sbt sia sib sii sin sio sir sis sit sna snb sni snn sno snr sns snt soa sob soi son soo sor sos sot sr- sra srb sri srn sro srr srs srt ss- ssa ssb ssi ssn sso ssr sss sst sta stb sti stn sto str sts stt taa tab tai tan tao tar tas tat tba tbb tbi tbn tbo tbr tbs tbt tia tib tii tin tio tir tis tit tna tnb tni tnn tno tnr tns tnt to- toa tob toi ton too tor tos tot tra trb tri trn tro trr trs trt tsa tsb tsi tsn tso tsr tss tst tta ttb tti ttn tto ttr tts ttt