b-p bbb bbi bbn bbp bbs bby bi- bib bii bin bip bis biy bnb bni bnn bnp bns bpb bpi bpn bpp bps bpy bsb bsi bsn bsp bss bsy by- byi byn byp bys ibb ibi ibn ibp ibs iby iib iii iin iip iis in- inb ini inn inp ins iny ipb ipi ipn ipp ips ipy is- isb isi isn isp iss isy iys iyy n-i nbb nbi nbn nbp nbs nib nii nin nip nis nnb nni nnn nnp nns npb npi npn npp nps nsb nsi nsn nsp nss nsy nyn nyp nys nyy p-p pbb pbi pbn pbp pbs pby pib pii pin pip pis pn- pnb pni pnn pnp pns pny ppb ppi ppn ppp pps ps- psb psi psn psp pss psy py- pyb pyn pys sbb sbi sbn sbp sbs sby sib sii sin sip sis snb sni snn snp sns sny spb spi spn spp sps spy ss- ssb ssi ssn ssp sss sy- syb syi syn syp sys ybi ybp ybs yby yii yin yip yis ynn ynp yns yny yps ysb ysi ysp yss ysy yyb yys yyy