-er a-a a-c aaa aac aae aah aak aar ac- aca acc ace ach ack acr aea aec aee aeh aek aer aha ahc ahe ahh ahk ahr aka akc ake akh akk akr ar- ara arc are arh ark arr c-- caa cac cae cah cak car cca ccc cce cch cck ccr ce- cea cec cee ceh cek cer ch- cha chc che chh chk chr cka ckc ckh cra crc cre crh crk crr eaa eac eae eah eak ear ec- eca ecc ece ech eck ecr eea eec eee eek eer eha ehc ehe ehh ehr eka ekc eke ekh ekr era erc ere erh erk err haa hac hae hah hak har hca hcc hce hch hck hcr he- hea hec hee heh hek her hha hhc hhe hhh hhk hhr hka hkh hkk hkr hr- hra hrc hre hrh hrk hrr ka- kaa kac kae kah kak kar kca kcc kce kch kck kcr ke- kea kec kee keh kek ker kha khe khh khk khr kkc kke kkh kkk kkr kra krc krk krr ra- raa rac rae rah rak rar rca rcc rce rch rcr re- rea rec ree reh rek rer rh- rha rhc rhe rhh rhr rkc rke rkk rra rrc rrh rrk rrr