bbb bbi bbn bbs bby bi- bib bii bin bis biy bnb bni bnn bns bsb bsi bsn bss bsy by- byi byn bys ibb ibi ibn ibs iby iib iii iin iis in- inb ini inn ins iny is- isb isi isn iss isy iys iyy n-i nbb nbi nbn nbs nib nii nin nis nnb nni nnn nns nsb nsi nsn nss nsy nyn nys nyy sbb sbi sbn sbs sby sib sii sin sis snb sni snn sns sny ss- ssb ssi ssn sss sy- syb syi syn sys ybi ybs yby yii yin yis ynn yns yny ysb ysi yss ysy yyb yys yyy