-er c-- ccc cce cch cco ccp ccr ccs ce- cec cee ceh ceo cep cer ces ch- chc che chh cho chp chr chs co- coc coe coh coo cop cor cos cpc cpe cph cpo cpp cpr cps crc cre crh cro crp crr crs csc cse csh cso csp csr css ec- ecc ece ech eco ecr ecs eec eee eeo eep eer ees ehc ehe ehh eho ehp ehr ehs eo- eoc eoe eoh eoo eop eor eos ep- epc epe eph epo epp epr eps erc ere erh ero erp err ers es- esc ese esh eso esp esr ess hcc hce hch hco hcp hcr hcs he- hec hee heh heo hep her hes hhc hhe hhh hho hhp hhr hhs hoc hoe hoh hoo hop hor hos hpc hpe hph hpo hpp hpr hps hr- hrc hre hrh hro hrp hrr hrs hsc hse hsh hsp hsr hss oc- occ och oco ocp ocr ocs oec oee oeh oeo oep oer oes ohc ohe ohh oho ohp ohr ohs oo- ooc ooh ooo oop oor oos op- opc ope oph opo opp opr ops or- orc ore orh oro orp orr ors os- osc ose osh oso osp osr oss p-p pcc pce pch pco pcp pcr pcs pec pee peh peo pep per pes phc phe pho php phr phs poc poe poh poo pop por pos ppc ppe pph ppo ppp ppr pps prc pre prh pro prp prr prs ps- psc pse psh pso psp psr pss rcc rce rch rco rcp rcr rcs re- rec ree reh reo rep rer res rh- rhc rhe rhh rho rhp rhr rhs roc roe roh roo rop ror ros rpc rpe rph rpo rpp rpr rps rrc rrh rrp rrr rrs rsc rse rsh rso rsp rsr rss scc sce sch sco scp scr scs se- sec see seh seo sep ser ses sh- shc she shh sho shp shr shs soc soe soh soo sop sor sos spc spe sph spo spp spr sps sr- src sre srh sro srp srr srs ss- ssc sse ssh sso ssp ssr sss