b-p bbb bbi bbn bbo bbp bbs bbt bi- bib bii bin bio bip bis bit bnb bni bnn bno bnp bns bnt bob boi bon boo bop bos bot bpb bpi bpn bpo bpp bps bpt bsb bsi bsn bso bsp bss bst btb bti btn bto btp bts btt ibb ibi ibn ibo ibp ibs ibt iib iii iin iio iip iis iit in- inb ini inn ino inp ins int io- iob ioi ion ioo iop ios iot ipb ipi ipn ipo ipp ips ipt is- isb isi isn iso isp iss ist itb iti itn ito itp its itt n-i nbb nbi nbn nbo nbp nbs nbt nib nii nin nio nip nis nit nnb nni nnn nno nnp nns nnt no- nob noi non noo nop nos not npb npi npn npo npp nps npt nsb nsi nsn nso nsp nss nst ntb nti ntn nto ntp nts ntt o-i ob- obb obi obn obo obp obs obt oib oii oin oio oip ois oit on- onb oni onn ono onp ons ont oo- oob ooi oon ooo oop oos oot op- opb opi opn opo opp ops opt os- osb osi osn oso osp oss ost ot- otb oti otn oto otp ots ott p-p pbb pbi pbn pbo pbp pbs pbt pib pii pin pio pip pis pit pn- pnb pni pnn pno pnp pns pnt pob poi pon poo pop pos pot ppb ppi ppn ppo ppp pps ppt ps- psb psi psn pso psp pss pst pt- ptb pti ptn pto ptp pts ptt sbb sbi sbn sbo sbp sbs sbt sib sii sin sio sip sis sit snb sni snn sno snp sns snt sob soi son soo sop sos sot spb spi spn spo spp sps spt ss- ssb ssi ssn sso ssp sss sst stb sti stn sto stp sts stt tbb tbi tbn tbo tbp tbs tbt tib tii tin tio tip tis tit tnb tni tnn tno tnp tns tnt to- tob toi ton too top tos tot tpb tpi tpn tpo tpp tps tpt tsb tsi tsn tso tsp tss tst ttb tti ttn tto ttp tts ttt