b-p bbb bbm bbn bbo bbp bbr bmb bmm bmn bmo bmp bmr bnb bnn bno bnp bnr bob bom bon boo bop bor bpb bpm bpn bpo bpp bpr brb brm brn bro brp brr m-o m-r mbb mbm mbo mbp mbr mmb mmm mmn mmo mmp mmr mnb mnm mnn mno mnp mnr mob mom mon moo mop mor mpb mpm mpn mpo mpp mpr mrb mrm mrn mro mrp mrr nbb nbm nbn nbo nbp nbr nmb nmm nmn nmo nmp nmr nnb nnm nnn nno nnp no- nob nom non noo nop nor npb npm npn npo npp npr nrb nrm nrn nro nrp nrr ob- obb obm obn obo obp obr om- omb omm omn omo omp omr on- onb onn ono onp onr oo- oob oom oon ooo oop oor op- opb opm opn opo opp opr or- orb orm orn oro orp orr p-p pbb pbm pbn pbo pbp pbr pmb pmm pmn pmo pmp pmr pn- pnb pnm pnn pno pnp pnr pob pom pon poo pop por ppb ppm ppn ppo ppp ppr prb prm prn pro prp prr rbb rbm rbn rbo rbp rbr rmb rmm rmn rmo rmp rmr rnb rnm rnn rno rnp rnr rob rom ron roo rop ror rpb rpm rpn rpo rpp rpr rrb rrm rrn rrp rrr