-er b-p bbb bbe bbi bbl bbp bbr bbs be- beb bee bei bel bep ber bes bi- bib bie bii bil bip bir bis blb ble bli bll blp blr bls bpb bpe bpi bpl bpp bpr bps brb bre bri brl brp brr brs bsb bse bsi bsl bsp bsr bss ebb ebe ebi ebl ebp ebr ebs eeb eee eel eep eer ees eib eie eii eil eip eir eis elb ele eli ell elp elr els ep- epb epe epi epl epp epr eps erb ere eri erl erp err ers es- esb ese esi esl esp esr ess ibb ibe ibi ibl ibp ibr ibs ie- iee iei iel iep ier ies iib iie iii iil iip iir iis il- ilb ile ili ill ilp ilr ils ipb ipe ipi ipl ipp ipr ips ir- irb ire iri irl irp irr irs is- isb ise isi isl isp isr iss l-p lbb lbe lbi lbl lbp lbr lbs leb lee lei lel lep ler les lib lie lii lil lip lir lis llb lle lli lll llp llr lls lpb lpe lpi lpl lpp lpr lps lrb lri lrp lrr lrs lsb lse lsi lsl lsp lsr lss p-p pbb pbe pbi pbl pbp pbr pbs peb pee pei pel pep per pes pib pie pii pil pip pir pis plb ple pli pll plp plr pls ppb ppe ppi ppl ppp ppr pps prb pre pri prl prp prr prs ps- psb pse psi psl psp psr pss rbb rbe rbi rbl rbp rbr rbs re- reb ree rei rel rep rer res rib rie rii ril rip rir ris rle rli rll rlp rlr rls rpb rpe rpi rpl rpp rpr rps rrb rri rrl rrp rrr rrs rsb rse rsi rsl rsp rsr rss sbb sbe sbi sbl sbp sbr sbs se- seb see sei sel sep ser ses sib sie sii sil sip sir sis slb sle sli sll slp slr sls spb spe spi spl spp spr sps sr- srb sre sri srl srp srr srs ss- ssb sse ssi ssl ssp ssr sss