bbb bbc bbd bbl bbs bcb bcc bcd bcl bcs bdb bdc bdd bdl bds blb blc bld bll bls bsb bsc bsd bsl bss c-- cbb cbc cbd cbl cbs ccb ccc ccd ccl ccs cdb cdc cdd cdl cds cl- clb clc cld cll cls csb csc csd csl css dbb dbc dbd dbl dbs dcb dcc dcd dcl dcs ddb ddc ddd ddl dds dl- dlb dlc dld dll dls dsb dsc dsd dsl dss lbb lbc lbd lbl lbs lcb lcc lcd lcl lcs ldb ldc ldd ldl lds llb llc lld lll lls lsb lsc lsd lsl lss sbb sbc sbd sbl sbs scb scc scd scl scs sdb sdc sdd sdl sds slb slc sld sll sls ss- ssb ssc ssd ssl sss