b-p bbb bbe bbl bbp bbs be- beb bee bel bep bes blb ble bll blp bls bpb bpe bpl bpp bps bsb bse bsl bsp bss ebb ebe ebl ebp ebs eeb eee eel eep ees elb ele ell elp els ep- epb epe epl epp eps es- esb ese esl esp ess l-p lbb lbe lbl lbp lbs leb lee lel lep les llb lle lll llp lls lpb lpe lpl lpp lps lsb lse lsl lsp lss p-p pbb pbe pbl pbp pbs peb pee pel pep pes plb ple pll plp pls ppb ppe ppl ppp pps ps- psb pse psl psp pss sbb sbe sbl sbp sbs se- seb see sel sep ses slb sle sll slp sls spb spe spl spp sps ss- ssb sse ssl ssp sss