bbb bbn bbo bbr bbs bnb bnn bno bnr bns bnz bob bon boo bor bos boz brb brn bro brr brs brz bsb bsn bso bsr bss bzn bzo bzr bzs bzz nbb nbn nbo nbr nbs nnb nnn nno nns nnz no- nob non noo nor nos noz nrb nrn nro nrr nrs nrz nsb nsn nso nsr nss nsz nzb nzo nzs nzz ob- obb obn obo obr obs on- onb onn ono onr ons oo- oob oon ooo oor oos or- orb orn oro orr ors orz os- osb osn oso osr oss ozo ozs ozz rbb rbn rbo rbr rbs rnb rnn rno rnr rns rnz rob ron roo ror ros roz rrb rrn rrr rrs rsb rsn rso rsr rss rzb rzo sbb sbn sbo sbr sbs snb snn sno snr sns sob son soo sor sos soz sr- srb srn sro srr srs ss- ssb ssn sso ssr sss ssz szr zbb zbr zbs znn zno zns zo- zob zon zoo zor zos zro zrs zsz zzr zzs zzz