-er a-a a-c aaa aac aae aah aap aar ac- aca acc ace ach acp acr aea aec aee aeh aep aer aha ahc ahe ahh ahp ahr ap- apa apc ape aph app apr ar- ara arc are arh arp arr c-- caa cac cae cah cap car cca ccc cce cch ccp ccr ce- cea cec cee ceh cep cer ch- cha chc che chh chp chr cpa cpc cpe cph cpp cpr cra crc cre crh crp crr eaa eac eae eah eap ear ec- eca ecc ece ech ecr eea eec eee eep eer eha ehc ehe ehh ehp ehr ep- epa epc epe eph epp epr era erc ere erh erp err haa hac hae hah hap har hca hcc hce hch hcp hcr he- hea hec hee heh hep her hha hhc hhe hhh hhp hhr hpa hpc hpe hph hpp hpr hr- hra hrc hre hrh hrp hrr p-p paa pac pae pah pap par pca pcc pce pch pcp pcr pea pec pee peh pep per pha phc phe php phr ppa ppc ppe pph ppp ppr pra prc pre prh prp prr ra- raa rac rae rah rap rar rca rcc rce rch rcp rcr re- rea rec ree reh rep rer rh- rha rhc rhe rhh rhp rhr rpa rpc rpe rph rpp rpr rra rrc rrh rrp rrr