-er b-p bbb bbe bbi bbk bbl bbp bbr be- beb bee bei bek bel bep ber bi- bib bie bii bik bil bip bir bkb bke bkk bkl bkp bkr blb ble bli blk bll blp blr bpb bpe bpi bpl bpp bpr brb bre bri brk brl brp brr ebb ebe ebi ebk ebl ebp ebr eeb eee eek eel eep eer eib eie eii eik eil eip eir ekb eke eki ekl ekp ekr elb ele eli elk ell elp elr ep- epb epe epi epl epp epr erb ere eri erk erl erp err ibb ibe ibi ibk ibl ibp ibr ie- iee iei iek iel iep ier iib iie iii iil iip iir ikb ike iki ikk ikl ikr il- ilb ile ili ilk ill ilp ilr ipb ipe ipi ipl ipp ipr ir- irb ire iri irk irl irp irr kbb kbe kbi kbk kbl kbp kbr ke- keb kee kei kek kel kep ker kib kie kii kik kil kip kir kkb kke kki kkk kkl kkp kkr kl- klb kli klr kpe kpi kpk kpl kpp kpr kri krk krl krp krr l-p lbb lbe lbi lbk lbl lbp lbr leb lee lei lek lel lep ler lib lie lii lik lil lip lir lkb lkl lkp lkr llb lle lli llk lll llp llr lpb lpe lpi lpk lpl lpp lpr lrb lri lrk lrp lrr p-p pbb pbe pbi pbk pbl pbp pbr peb pee pei pek pel pep per pib pie pii pik pil pip pir pkb pke pki pkl pkp pkr plb ple pli plk pll plp plr ppb ppe ppi ppk ppl ppp ppr prb pre pri prk prl prp prr rbb rbe rbi rbk rbl rbp rbr re- reb ree rei rek rel rep rer rib rie rii rik ril rip rir rkb rke rkk rkp rle rli rll rlp rlr rpb rpe rpi rpk rpl rpp rpr rrb rri rrk rrl rrp rrr