-er bbb bbc bbe bbh bbr bcb bcc bce bch bcr be- beb bec bee beh ber bhb bhc bhe bhh bhr brb bre brh brr c-- cbb cbc cbe cbh cbr ccb ccc cce cch ccr ce- ceb cec cee ceh cer ch- chb chc che chh chr crb crc cre crh crr ebb ebc ebe ebh ebr ec- ecb ecc ece ech ecr eeb eec eee eer ehb ehc ehe ehh ehr erb erc ere erh err hbb hbc hbe hbh hbr hcb hcc hce hch hcr he- heb hec hee heh her hhb hhc hhe hhh hhr hr- hrb hrc hre hrh hrr rbb rbc rbe rbh rbr rcb rcc rce rch rcr re- reb rec ree reh rer rh- rhb rhc rhe rhh rhr rrb rrc rrh rrr