b-p bbb bbe bbp bbs bbt be- beb bee bep bes bet bpb bpe bpp bps bpt bsb bse bsp bss bst btb bte btp bts btt ebb ebe ebp ebs ebt eeb eee eep ees eet ep- epb epe epp eps ept es- esb ese esp ess est etb ete etp ets ett p-p pbb pbe pbp pbs pbt peb pee pep pes pet ppb ppe ppp pps ppt ps- psb pse psp pss pst pt- ptb pte ptp pts ptt sbb sbe sbp sbs sbt se- seb see sep ses set spb spe spp sps spt ss- ssb sse ssp sss sst stb ste stp sts stt tbb tbe tbp tbs tbt te- teb tee tep tes tet tpb tpe tpp tps tpt tsb tse tsp tss tst ttb tte ttp tts ttt