bbb bbn bbo bbr bbs bbt bnb bnn bno bnr bns bnt bnz bob bon boo bor bos bot boz brb brn bro brr brs brt brz bsb bsn bso bsr bss bst btb btn bto btr bts btt btz bzn bzo bzr bzs bzz nbb nbn nbo nbr nbs nbt nnb nnn nno nns nnt nnz no- nob non noo nor nos not noz nrb nrn nro nrr nrs nrt nrz nsb nsn nso nsr nss nst nsz ntb ntn nto ntr nts ntt ntz nzb nzo nzs nzz ob- obb obn obo obr obs obt on- onb onn ono onr ons ont oo- oob oon ooo oor oos oot or- orb orn oro orr ors ort orz os- osb osn oso osr oss ost ot- otb otn oto otr ots ott otz ozo ozs ozt ozz rbb rbn rbo rbr rbs rbt rnb rnn rno rnr rns rnt rnz rob ron roo ror ros rot roz rrb rrn rrr rrs rrt rsb rsn rso rsr rss rst rtb rtn rto rtr rts rtt rtz rzb rzo sbb sbn sbo sbr sbs sbt snb snn sno snr sns snt sob son soo sor sos sot soz sr- srb srn sro srr srs srt ss- ssb ssn sso ssr sss sst ssz stb stn sto str sts stt stz szr tbb tbn tbo tbr tbs tbt tbz tnb tnn tno tnr tns tnt tnz to- tob ton too tor tos tot toz trb trn tro trr trs trt trz tsb tsn tso tsr tss tst ttb ttn tto ttr tts ttt tzs zbb zbr zbs zbt znn zno zns zo- zob zon zoo zor zos zot zro zrs zst zsz ztr zzr zzs zzt zzz