-er bbb bbc bbd bbe bbh bbr bcb bcc bcd bce bch bcr bdb bdc bdd bde bdh bdr be- beb bec bed bee beh ber bhb bhc bhd bhe bhh bhr brb brd bre brh brr c-- cbb cbc cbd cbe cbh cbr ccb ccc ccd cce cch ccr cdb cdc cdd cde cdh cdr ce- ceb cec ced cee ceh cer ch- chb chc chd che chh chr crb crc crd cre crh crr dbb dbc dbd dbe dbh dbr dcb dcc dcd dce dcr ddb ddc ddd dde ddh ddr de- deb dec ded dee deh der dh- dhb dhc dhd dhe dhh dhr drb drc drd dre drr ebb ebc ebd ebe ebh ebr ec- ecb ecc ecd ece ech ecr ed- edb edc edd ede edh edr eeb eec eed eee eer ehb ehc ehd ehe ehh ehr erb erc erd ere erh err hbb hbc hbd hbe hbh hbr hcb hcc hcd hce hch hcr hdb hdc hdd hde hdh hdr he- heb hec hed hee heh her hhb hhc hhd hhe hhh hhr hr- hrb hrc hrd hre hrh hrr rbb rbc rbd rbe rbh rbr rcb rcc rcd rce rch rcr rdb rdc rdd rde rdh rdr re- reb rec red ree reh rer rh- rhb rhc rhd rhe rhh rhr rrb rrc rrd rrh rrr