a-a a-b a-i aaa aab aai aan aao aas aay ab- aba abb abi abn abo abs aby ai- aia aib aii ain aio ais aiy an- ana anb ani ann ano ans any aoa aob aoi aon aoo aos as- asa asb asi asn aso ass asy ay- aya ayi ayn ayo ays baa bab bai ban bao bas bay bba bbb bbi bbn bbo bbs bby bi- bia bib bii bin bio bis biy bna bnb bni bnn bno bns boa bob boi bon boo bos boy bsa bsb bsi bsn bso bss bsy by- bya byi byn byo bys ia- iaa iab iai ian iao ias iba ibb ibi ibn ibo ibs iby iia iib iii iin iio iis in- ina inb ini inn ino ins iny io- ioa iob ioi ion ioo ios is- isa isb isi isn iso iss isy iya iyo iys iyy n-i naa nab nai nan nao nas nay nba nbb nbi nbn nbo nbs nia nib nii nin nio nis nna nnb nni nnn nno nns no- noa nob noi non noo nos noy nsa nsb nsi nsn nso nss nsy nya nyn nyo nys nyy o-i oaa oab oai oan oao oas ob- oba obb obi obn obo obs oby oia oib oii oin oio ois on- ona onb oni onn ono ons ony oo- ooa oob ooi oon ooo oos os- osa osb osi osn oso oss oya oyi oyo oys saa sab sai san sao sas say sba sbb sbi sbn sbo sbs sby sia sib sii sin sio sis sna snb sni snn sno sns sny soa sob soi son soo sos soy ss- ssa ssb ssi ssn sso sss sy- sya syb syi syn sys yaa yab yai yan yao yas yay ybi ybs yby yii yin yio yis yna ynn yns yny yob yoi yon yoo yos yoy ysa ysb ysi yso yss ysy yyb yys yyy