-er a-a a-c aaa aac aae aah aao aap aar ac- aca acc ace ach aco acp acr aea aec aee aeh aeo aep aer aha ahc ahe ahh aho ahp ahr aoa aoc aoe aoh aoo aop aor ap- apa apc ape aph apo app apr ar- ara arc are arh aro arp arr c-- caa cac cae cah cao cap car cca ccc cce cch cco ccp ccr ce- cea cec cee ceh ceo cep cer ch- cha chc che chh cho chp chr co- coa coc coe coh coo cop cor cpa cpc cpe cph cpo cpp cpr cra crc cre crh cro crp crr eaa eac eae eah eao eap ear ec- eca ecc ece ech eco ecr eea eec eee eeo eep eer eha ehc ehe ehh eho ehp ehr eo- eoa eoc eoe eoh eoo eop eor ep- epa epc epe eph epo epp epr era erc ere erh ero erp err haa hac hae hah hao hap har hca hcc hce hch hco hcp hcr he- hea hec hee heh heo hep her hha hhc hhe hhh hho hhp hhr hoa hoc hoe hoh hoo hop hor hpa hpc hpe hph hpo hpp hpr hr- hra hrc hre hrh hro hrp hrr oaa oac oae oah oao oap oar oc- oca occ och oco ocp ocr oea oec oee oeh oeo oep oer oha ohc ohe ohh oho ohp ohr oo- ooa ooc ooh ooo oop oor op- opa opc ope oph opo opp opr or- ora orc ore orh oro orp orr p-p paa pac pae pah pao pap par pca pcc pce pch pco pcp pcr pea pec pee peh peo pep per pha phc phe pho php phr poa poc poe poh poo pop por ppa ppc ppe pph ppo ppp ppr pra prc pre prh pro prp prr ra- raa rac rae rah rao rap rar rca rcc rce rch rco rcp rcr re- rea rec ree reh reo rep rer rh- rha rhc rhe rhh rho rhp rhr roa roc roe roh roo rop ror rpa rpc rpe rph rpo rpp rpr rra rrc rrh rrp rrr