-er a-a a-c aaa aac aae aah aao aar ac- aca acc ace ach aco acr aea aec aee aeh aeo aer aha ahc ahe ahh aho ahr aoa aoc aoe aoh aoo aor ar- ara arc are arh aro arr c-- caa cac cae cah cao car cca ccc cce cch cco ccr ce- cea cec cee ceh ceo cer ch- cha chc che chh cho chr co- coa coc coe coh coo cor cra crc cre crh cro crr eaa eac eae eah eao ear ec- eca ecc ece ech eco ecr eea eec eee eeo eer eha ehc ehe ehh eho ehr eo- eoa eoc eoe eoh eoo eor era erc ere erh ero err haa hac hae hah hao har hca hcc hce hch hco hcr he- hea hec hee heh heo her hha hhc hhe hhh hho hhr hoa hoc hoe hoh hoo hor hr- hra hrc hre hrh hro hrr oaa oac oae oah oao oar oc- oca occ och oco ocr oea oec oee oeh oeo oer oha ohc ohe ohh oho ohr oo- ooa ooc ooh ooo oor or- ora orc ore orh oro orr ra- raa rac rae rah rao rar rca rcc rce rch rco rcr re- rea rec ree reh reo rer rh- rha rhc rhe rhh rho rhr roa roc roe roh roo ror rra rrc rrh rrr