b-p bbb bbe bbi bbp bbs bbt be- beb bee bei bep bes bet bi- bib bie bii bip bis bit bpb bpe bpi bpp bps bpt bsb bse bsi bsp bss bst btb bte bti btp bts btt ebb ebe ebi ebp ebs ebt eeb eee eep ees eet eib eie eii eip eis eit ep- epb epe epi epp eps ept es- esb ese esi esp ess est etb ete eti etp ets ett ibb ibe ibi ibp ibs ibt ie- iee iei iep ies iet iib iie iii iip iis iit ipb ipe ipi ipp ips ipt is- isb ise isi isp iss ist itb ite iti itp its itt p-p pbb pbe pbi pbp pbs pbt peb pee pei pep pes pet pib pie pii pip pis pit ppb ppe ppi ppp pps ppt ps- psb pse psi psp pss pst pt- ptb pte pti ptp pts ptt sbb sbe sbi sbp sbs sbt se- seb see sei sep ses set sib sie sii sip sis sit spb spe spi spp sps spt ss- ssb sse ssi ssp sss sst stb ste sti stp sts stt tbb tbe tbi tbp tbs tbt te- teb tee tei tep tes tet tib tie tii tip tis tit tpb tpe tpi tpp tps tpt tsb tse tsi tsp tss tst ttb tte tti ttp tts ttt