b-p bbb bbi bbn bbo bbp bbr bi- bib bii bin bio bip bir biz bnb bni bnn bno bnp bnr bnz bob boi bon boo bop bor boz bpb bpi bpn bpo bpp bpr brb bri brn bro brp brr brz bzn bzo bzp bzr bzz ibb ibi ibn ibo ibp ibr ibz iib iii iin iio iip iir in- inb ini inn ino inp inr io- iob ioi ion ioo iop ior ipb ipi ipn ipo ipp ipr ir- irb iri irn iro irp irr izi izo izz n-i nbb nbi nbn nbo nbp nbr nib nii nin nio nip nir niz nnb nni nnn nno nnp nnz no- nob noi non noo nop nor noz npb npi npn npo npp npr npz nrb nri nrn nro nrp nrr nrz nzb nzi nzo nzp nzz o-i ob- obb obi obn obo obp obr oib oii oin oio oip oir oiz on- onb oni onn ono onp onr oo- oob ooi oon ooo oop oor op- opb opi opn opo opp opr or- orb ori orn oro orp orr orz ozo ozz p-p pbb pbi pbn pbo pbp pbr pbz pib pii pin pio pip pir piz pn- pnb pni pnn pno pnp pnr pob poi pon poo pop por poz ppb ppi ppn ppo ppp ppr ppz prb pri prn pro prp prr prz pzp rbb rbi rbn rbo rbp rbr rib rii rin rio rip rir riz rnb rni rnn rno rnp rnr rnz rob roi ron roo rop ror roz rpb rpi rpn rpo rpp rpr rpz rrb rri rrn rrp rrr rzb rzo zbb zbr zib zin zio zip zir ziz znn zno znp zo- zob zoi zon zoo zor zpi zpo zpp zpr zro zrp zzr zzz