bbb bbi bbn bbr bbs bi- bib bii bin bir bis biz bnb bni bnn bnr bns bnz brb bri brn brr brs brz bsb bsi bsn bsr bss bzn bzr bzs bzz ibb ibi ibn ibr ibs ibz iib iii iin iir iis in- inb ini inn inr ins ir- irb iri irn irr irs is- isb isi isn isr iss izi izz n-i nbb nbi nbn nbr nbs nib nii nin nir nis niz nnb nni nnn nns nnz nrb nri nrn nrr nrs nrz nsb nsi nsn nsr nss nsz nzb nzi nzs nzz rbb rbi rbn rbr rbs rib rii rin rir ris riz rnb rni rnn rnr rns rnz rrb rri rrn rrr rrs rsb rsi rsn rsr rss rzb sbb sbi sbn sbr sbs sib sii sin sir sis snb sni snn snr sns sr- srb sri srn srr srs ss- ssb ssi ssn ssr sss ssz szi szr zbb zbr zbs zib zin zir zis ziz znn zns zrs zsi zsz zzr zzs zzz