-er b-p bbb bbe bbn bbp bbr bbs bbt be- beb bee ben bep ber bes bet bnb bne bnn bnp bnr bns bnt bpb bpe bpn bpp bpr bps bpt brb bre brn brp brr brs brt bsb bse bsn bsp bsr bss bst btb bte btn btp btr bts btt ebb ebe ebn ebp ebr ebs ebt eeb eee een eep eer ees eet en- enb ene enn enp enr ens ent ep- epb epe epn epp epr eps ept erb ere ern erp err ers ert es- esb ese esn esp esr ess est etb ete etn etp etr ets ett nbb nbe nbn nbp nbr nbs nbt ne- neb nee nen nep ner nes net nnb nne nnn nnp nns nnt npb npe npn npp npr nps npt nrb nre nrn nrp nrr nrs nrt nsb nse nsn nsp nsr nss nst ntb nte ntn ntp ntr nts ntt p-p pbb pbe pbn pbp pbr pbs pbt peb pee pen pep per pes pet pn- pnb pne pnn pnp pnr pns pnt ppb ppe ppn ppp ppr pps ppt prb pre prn prp prr prs prt ps- psb pse psn psp psr pss pst pt- ptb pte ptn ptp ptr pts ptt rbb rbe rbn rbp rbr rbs rbt re- reb ree ren rep rer res ret rnb rnn rnp rnr rns rnt rpb rpe rpn rpp rpr rps rpt rrb rrn rrp rrr rrs rrt rsb rse rsn rsp rsr rss rst rtb rte rtn rtp rtr rts rtt sbb sbe sbn sbp sbr sbs sbt se- seb see sen sep ser ses set snb sne snn snp snr sns snt spb spe spn spp spr sps spt sr- srb sre srn srp srr srs srt ss- ssb sse ssn ssp ssr sss sst stb ste stn stp str sts stt tbb tbe tbn tbp tbr tbs tbt te- teb tee ten tep ter tes tet tnb tne tnn tnp tnr tns tnt tpb tpe tpn tpp tpr tps tpt trb tre trn trp trr trs trt tsb tse tsn tsp tsr tss tst ttb tte ttn ttp ttr tts ttt