-er b-p bbb bbc bbe bbh bbn bbp bbr bbs bcb bcc bce bch bcn bcp bcr bcs be- beb bec bee beh ben bep ber bes bhb bhc bhe bhh bhp bhr bhs bnb bnc bne bnn bnp bnr bns bpb bpc bpe bph bpn bpp bpr bps brb bre brh brn brp brr brs bsb bsc bse bsh bsn bsp bsr bss c-- cbb cbc cbe cbh cbn cbp cbr cbs ccb ccc cce cch ccn ccp ccr ccs ce- ceb cec cee ceh cen cep cer ces ch- chb chc che chh chn chp chr chs cn- cnb cnc cne cnh cnn cnp cnr cns cpb cpc cpe cph cpn cpp cpr cps crb crc cre crh crn crp crr crs csb csc cse csh csn csp csr css ebb ebc ebe ebh ebn ebp ebr ebs ec- ecb ecc ece ech ecn ecr ecs eeb eec eee een eep eer ees ehb ehc ehe ehh ehn ehp ehr ehs en- enb enc ene enh enn enp enr ens ep- epb epc epe eph epn epp epr eps erb erc ere erh ern erp err ers es- esb esc ese esh esn esp esr ess hbb hbc hbe hbh hbn hbp hbr hbs hcb hcc hce hch hcn hcp hcr hcs he- heb hec hee heh hen hep her hes hhb hhc hhe hhh hhn hhp hhr hhs hnb hnc hne hnh hnn hns hpb hpc hpe hph hpn hpp hpr hps hr- hrb hrc hre hrh hrn hrp hrr hrs hsb hsc hse hsh hsn hsp hsr hss nbb nbc nbe nbn nbp nbr nbs ncb ncc nce nch ncn ncp ncr ncs ne- neb nec nee neh nen nep ner nes nhb nhc nhe nhh nhn nhp nhr nhs nnb nnc nne nnh nnn nnp nns npb npc npe nph npn npp npr nps nrb nrc nre nrn nrp nrr nrs nsb nsc nse nsh nsn nsp nsr nss p-p pbb pbc pbe pbn pbp pbr pbs pcb pcc pce pch pcn pcp pcr pcs peb pec pee peh pen pep per pes phb phc phe phn php phr phs pn- pnb pnc pne pnh pnn pnp pnr pns ppb ppc ppe pph ppn ppp ppr pps prb prc pre prh prn prp prr prs ps- psb psc pse psh psn psp psr pss rbb rbc rbe rbh rbn rbp rbr rbs rcb rcc rce rch rcn rcp rcr rcs re- reb rec ree reh ren rep rer res rh- rhb rhc rhe rhh rhn rhp rhr rhs rnb rnc rnh rnn rnp rnr rns rpb rpc rpe rph rpn rpp rpr rps rrb rrc rrh rrn rrp rrr rrs rsb rsc rse rsh rsn rsp rsr rss sbb sbc sbe sbh sbn sbp sbr sbs scb scc sce sch scn scp scr scs se- seb sec see seh sen sep ser ses sh- shb shc she shh shn shp shr shs snb snc sne snn snp snr sns spb spc spe sph spn spp spr sps sr- srb src sre srh srn srp srr srs ss- ssb ssc sse ssh ssn ssp ssr sss