bbb bbi bbn bbo bbs bby bi- bib bii bin bio bis biy bnb bni bnn bno bns bob boi bon boo bos boy bsb bsi bsn bso bss bsy by- byi byn byo bys ibb ibi ibn ibo ibs iby iib iii iin iio iis in- inb ini inn ino ins iny io- iob ioi ion ioo ios is- isb isi isn iso iss isy iyo iys iyy n-i nbb nbi nbn nbo nbs nib nii nin nio nis nnb nni nnn nno nns no- nob noi non noo nos noy nsb nsi nsn nso nss nsy nyn nyo nys nyy o-i ob- obb obi obn obo obs oby oib oii oin oio ois on- onb oni onn ono ons ony oo- oob ooi oon ooo oos os- osb osi osn oso oss oyi oyo oys sbb sbi sbn sbo sbs sby sib sii sin sio sis snb sni snn sno sns sny sob soi son soo sos soy ss- ssb ssi ssn sso sss sy- syb syi syn sys ybi ybs yby yii yin yio yis ynn yns yny yob yoi yon yoo yos yoy ysb ysi yso yss ysy yyb yys yyy