-er b-p bbb bbe bbi bbl bbn bbp bbr bbs bbx be- beb bee bei bel ben bep ber bes bex bi- bib bie bii bil bin bip bir bis bix blb ble bli bll bln blp blr bls blx bnb bne bni bnl bnn bnp bnr bns bnx bpb bpe bpi bpl bpn bpp bpr bps bpx brb bre bri brl brn brp brr brs brx bsb bse bsi bsl bsn bsp bsr bss bsx bxb bxi bxl bxn bxx ebb ebe ebi ebl ebn ebp ebr ebs ebx eeb eee eel een eep eer ees eex eib eie eii eil ein eip eir eis eix elb ele eli ell eln elp elr els elx en- enb ene eni enl enn enp enr ens ep- epb epe epi epl epn epp epr eps epx erb ere eri erl ern erp err ers es- esb ese esi esl esn esp esr ess esx ex- exe exi exl exp exr exs exx ibb ibe ibi ibl ibn ibp ibr ibs ibx ie- iee iei iel ien iep ier ies iex iib iie iii iil iin iip iir iis iix il- ilb ile ili ill iln ilp ilr ils ilx in- inb ine ini inl inn inp inr ins inx ipb ipe ipi ipl ipn ipp ipr ips ipx ir- irb ire iri irl irn irp irr irs irx is- isb ise isi isl isn isp isr iss ixe ixi ixl ixn l-p lbb lbe lbi lbl lbp lbr lbs lbx leb lee lei lel len lep ler les lex lib lie lii lil lin lip lir lis lix llb lle lli lll lln llp llr lls lnb lne lni lnl lnn lnp lnr lns lpb lpe lpi lpl lpn lpp lpr lps lpx lrb lri lrn lrp lrr lrs lsb lse lsi lsl lsn lsp lsr lss lxi lxr lxx n-i nbb nbe nbi nbl nbn nbp nbr nbs nbx ne- neb nee nei nel nen nep ner nes nex nib nie nii nil nin nip nir nis nix nlb nle nli nll nln nlp nlr nls nlx nnb nne nni nnl nnn nnp nns npb npe npi npl npn npp npr nps nrb nre nri nrl nrn nrp nrr nrs nrx nsb nse nsi nsl nsn nsp nsr nss nsx nxl p-p pbb pbe pbi pbl pbn pbp pbr pbs pbx peb pee pei pel pen pep per pes pex pib pie pii pil pin pip pir pis pix plb ple pli pll pln plp plr pls plx pn- pnb pne pni pnl pnn pnp pnr pns pnx ppb ppe ppi ppl ppn ppp ppr pps ppx prb pre pri prl prn prp prr prs prx ps- psb pse psi psl psn psp psr pss psx pxe pxl pxr pxs rbb rbe rbi rbl rbn rbp rbr rbs rbx re- reb ree rei rel ren rep rer res rex rib rie rii ril rin rip rir ris rix rle rli rll rln rlp rlr rls rnb rni rnn rnp rnr rns rpb rpe rpi rpl rpn rpp rpr rps rpx rrb rri rrl rrn rrp rrr rrs rsb rse rsi rsl rsn rsp rsr rss rsx rxp rxr rxs sbb sbe sbi sbl sbn sbp sbr sbs sbx se- seb see sei sel sen sep ser ses sex sib sie sii sil sin sip sir sis six slb sle sli sll sln slp slr sls slx snb sne sni snl snn snp snr sns spb spe spi spl spn spp spr sps spx sr- srb sre sri srl srn srp srr srs srx ss- ssb sse ssi ssl ssn ssp ssr sss ssx sxi sxl sxn sxs xbe xbl xbr xbx xee xel xen xep xer xes xex xie xii xin xis xix xlb xli xlr xls xns xpb xpe xpl xpn xpp xps xrx xsb xsi xsl xsp xss xxi xxl xxp xxx