b-p bbb bbi bbn bbp bbs bbx bi- bib bii bin bip bis bix bnb bni bnn bnp bns bnx bpb bpi bpn bpp bps bpx bsb bsi bsn bsp bss bsx bxb bxi bxn bxx ibb ibi ibn ibp ibs ibx iib iii iin iip iis iix in- inb ini inn inp ins inx ipb ipi ipn ipp ips ipx is- isb isi isn isp iss ixi ixn n-i nbb nbi nbn nbp nbs nbx nib nii nin nip nis nix nnb nni nnn nnp nns npb npi npn npp nps nsb nsi nsn nsp nss nsx p-p pbb pbi pbn pbp pbs pbx pib pii pin pip pis pix pn- pnb pni pnn pnp pns pnx ppb ppi ppn ppp pps ppx ps- psb psi psn psp pss psx pxs sbb sbi sbn sbp sbs sbx sib sii sin sip sis six snb sni snn snp sns spb spi spn spp sps spx ss- ssb ssi ssn ssp sss ssx sxi sxn sxs xbx xii xin xis xix xns xpb xpn xpp xps xsb xsi xsp xss xxi xxp xxx