bbb bbc bbd bbh bbk bcb bcc bcd bch bck bdb bdc bdd bdh bdk bhb bhc bhd bhh bhk bkb bkc bkk c-- cbb cbc cbd cbh cbk ccb ccc ccd cch cck cdb cdc cdd cdh cdk ch- chb chc chd chh chk ckb ckc ckd ckh dbb dbc dbd dbh dbk dcb dcc dcd dck ddb ddc ddd ddh ddk dh- dhb dhc dhd dhh dhk dkb dkc dkk hbb hbc hbd hbh hbk hcb hcc hcd hch hck hdb hdc hdd hdh hdk hhb hhc hhd hhh hhk hkb hkd hkh hkk kbb kbc kbd kbh kbk kcb kcc kcd kch kck kdb kdc kdh kdk khh khk kkb kkc kkh kkk