bbb bbc bbd bbf bbs bcb bcc bcd bcf bcs bdb bdc bdd bdf bds bfb bfc bfd bff bfs bsb bsc bsd bsf bss c-- cbb cbc cbd cbf cbs ccb ccc ccd ccf ccs cdb cdc cdd cdf cds cfb cfc cfd cff cfs csb csc csd csf css dbb dbc dbd dbf dbs dcb dcc dcd dcf dcs ddb ddc ddd ddf dds dfb dfc dfd dff dfs dsb dsc dsd dsf dss fbb fbc fbd fbf fbs fcb fcc fcd fcf fcs fdb fdc fdd fdf fds ffc ffd fff ffs fsb fsc fsd fsf fss sbb sbc sbd sbf sbs scb scc scd scf scs sdb sdc sdd sdf sds sfb sfc sfd sff sfs ss- ssb ssc ssd ssf sss