-er b-p bbb bbc bbe bbh bbn bbo bbp bbr bbs bcb bcc bce bch bcn bco bcp bcr bcs be- beb bec bee beh ben beo bep ber bes bhb bhc bhe bhh bho bhp bhr bhs bnb bnc bne bnn bno bnp bnr bns bob boc boe boh bon boo bop bor bos bpb bpc bpe bph bpn bpo bpp bpr bps brb bre brh brn bro brp brr brs bsb bsc bse bsh bsn bso bsp bsr bss c-- cbb cbc cbe cbh cbn cbo cbp cbr cbs ccb ccc cce cch ccn cco ccp ccr ccs ce- ceb cec cee ceh cen ceo cep cer ces ch- chb chc che chh chn cho chp chr chs cn- cnb cnc cne cnh cnn cno cnp cnr cns co- cob coc coe coh con coo cop cor cos cpb cpc cpe cph cpn cpo cpp cpr cps crb crc cre crh crn cro crp crr crs csb csc cse csh csn cso csp csr css ebb ebc ebe ebh ebn ebo ebp ebr ebs ec- ecb ecc ece ech ecn eco ecr ecs eeb eec eee een eeo eep eer ees ehb ehc ehe ehh ehn eho ehp ehr ehs en- enb enc ene enh enn eno enp enr ens eo- eob eoc eoe eoh eon eoo eop eor eos ep- epb epc epe eph epn epo epp epr eps erb erc ere erh ern ero erp err ers es- esb esc ese esh esn eso esp esr ess hbb hbc hbe hbh hbn hbo hbp hbr hbs hcb hcc hce hch hcn hco hcp hcr hcs he- heb hec hee heh hen heo hep her hes hhb hhc hhe hhh hhn hho hhp hhr hhs hnb hnc hne hnh hnn hno hns hob hoc hoe hoh hon hoo hop hor hos hpb hpc hpe hph hpn hpo hpp hpr hps hr- hrb hrc hre hrh hrn hro hrp hrr hrs hsb hsc hse hsh hsn hsp hsr hss nbb nbc nbe nbn nbo nbp nbr nbs ncb ncc nce nch ncn nco ncp ncr ncs ne- neb nec nee neh nen neo nep ner nes nhb nhc nhe nhh nhn nhp nhr nhs nnb nnc nne nnh nnn nno nnp nns no- nob noc noe noh non noo nop nor nos npb npc npe nph npn npo npp npr nps nrb nrc nre nrn nro nrp nrr nrs nsb nsc nse nsh nsn nso nsp nsr nss ob- obb obc obe obh obn obo obp obr obs oc- ocb occ och ocn oco ocp ocr ocs oeb oec oee oeh oen oeo oep oer oes ohc ohe ohh ohn oho ohp ohr ohs on- onb onc one onh onn ono onp onr ons oo- oob ooc ooh oon ooo oop oor oos op- opb opc ope oph opn opo opp opr ops or- orb orc ore orh orn oro orp orr ors os- osb osc ose osh osn oso osp osr oss p-p pbb pbc pbe pbn pbo pbp pbr pbs pcb pcc pce pch pcn pco pcp pcr pcs peb pec pee peh pen peo pep per pes phb phc phe phn pho php phr phs pn- pnb pnc pne pnh pnn pno pnp pnr pns pob poc poe poh pon poo pop por pos ppb ppc ppe pph ppn ppo ppp ppr pps prb prc pre prh prn pro prp prr prs ps- psb psc pse psh psn pso psp psr pss rbb rbc rbe rbh rbn rbo rbp rbr rbs rcb rcc rce rch rcn rco rcp rcr rcs re- reb rec ree reh ren reo rep rer res rh- rhb rhc rhe rhh rhn rho rhp rhr rhs rnb rnc rnh rnn rno rnp rnr rns rob roc roe roh ron roo rop ror ros rpb rpc rpe rph rpn rpo rpp rpr rps rrb rrc rrh rrn rrp rrr rrs rsb rsc rse rsh rsn rso rsp rsr rss sbb sbc sbe sbh sbn sbo sbp sbr sbs scb scc sce sch scn sco scp scr scs se- seb sec see seh sen seo sep ser ses sh- shb shc she shh shn sho shp shr shs snb snc sne snn sno snp snr sns sob soc soe soh son soo sop sor sos spb spc spe sph spn spo spp spr sps sr- srb src sre srh srn sro srp srr srs ss- ssb ssc sse ssh ssn sso ssp ssr sss