a-a a-b a-i aaa aab aai aan aao aar aas aay ab- aba abb abi abn abo abr abs aby ai- aia aib aii ain aio air ais aiy an- ana anb ani ann ano anr ans any aoa aob aoi aon aoo aor aos ar- ara arb ari arn aro arr ars ary as- asa asb asi asn aso asr ass asy ay- aya ayi ayn ayo ayr ays baa bab bai ban bao bar bas bay bba bbb bbi bbn bbo bbr bbs bby bi- bia bib bii bin bio bir bis biy bna bnb bni bnn bno bnr bns boa bob boi bon boo bor bos boy bra brb bri brn bro brr brs bry bsa bsb bsi bsn bso bsr bss bsy by- bya byi byn byo byr bys ia- iaa iab iai ian iao iar ias iba ibb ibi ibn ibo ibr ibs iby iia iib iii iin iio iir iis in- ina inb ini inn ino inr ins iny io- ioa iob ioi ion ioo ior ios ir- ira irb iri irn iro irr irs iry is- isa isb isi isn iso isr iss isy iya iyo iyr iys iyy n-i naa nab nai nan nao nar nas nay nba nbb nbi nbn nbo nbr nbs nia nib nii nin nio nir nis nna nnb nni nnn nno nns no- noa nob noi non noo nor nos noy nra nrb nri nrn nro nrr nrs nry nsa nsb nsi nsn nso nsr nss nsy nya nyn nyo nys nyy o-i oaa oab oai oan oao oar oas ob- oba obb obi obn obo obr obs oby oia oib oii oin oio oir ois on- ona onb oni onn ono onr ons ony oo- ooa oob ooi oon ooo oor oos or- ora orb ori orn oro orr ors ory os- osa osb osi osn oso osr oss oya oyi oyo oys ra- raa rab rai ran rao rar ras ray rba rbb rbi rbn rbo rbr rbs ria rib rii rin rio rir ris riy rna rnb rni rnn rno rnr rns rny roa rob roi ron roo ror ros roy rra rrb rri rrn rrr rrs rsa rsb rsi rsn rso rsr rss ry- rya ryn ryo ryr rys ryy saa sab sai san sao sar sas say sba sbb sbi sbn sbo sbr sbs sby sia sib sii sin sio sir sis sna snb sni snn sno snr sns sny soa sob soi son soo sor sos soy sr- sra srb sri srn sro srr srs sry ss- ssa ssb ssi ssn sso ssr sss sy- sya syb syi syn syr sys yaa yab yai yan yao yar yas yay ybi ybr ybs yby yii yin yio yir yis yna ynn yns yny yob yoi yon yoo yor yos yoy yra yrn yro yrs ysa ysb ysi yso ysr yss ysy yyb yys yyy