b-p bbb bbn bbo bbp bbs bbt bnb bnn bno bnp bns bnt bob bon boo bop bos bot bpb bpn bpo bpp bps bpt bsb bsn bso bsp bss bst btb btn bto btp bts btt nbb nbn nbo nbp nbs nbt nnb nnn nno nnp nns nnt no- nob non noo nop nos not npb npn npo npp nps npt nsb nsn nso nsp nss nst ntb ntn nto ntp nts ntt ob- obb obn obo obp obs obt on- onb onn ono onp ons ont oo- oob oon ooo oop oos oot op- opb opn opo opp ops opt os- osb osn oso osp oss ost ot- otb otn oto otp ots ott p-p pbb pbn pbo pbp pbs pbt pn- pnb pnn pno pnp pns pnt pob pon poo pop pos pot ppb ppn ppo ppp pps ppt ps- psb psn pso psp pss pst pt- ptb ptn pto ptp pts ptt sbb sbn sbo sbp sbs sbt snb snn sno snp sns snt sob son soo sop sos sot spb spn spo spp sps spt ss- ssb ssn sso ssp sss sst stb stn sto stp sts stt tbb tbn tbo tbp tbs tbt tnb tnn tno tnp tns tnt to- tob ton too top tos tot tpb tpn tpo tpp tps tpt tsb tsn tso tsp tss tst ttb ttn tto ttp tts ttt