bbb bbc bbd bbk bbs bbt bcb bcc bcd bck bcs bct bdb bdc bdd bdk bds bdt bkb bkc bkk bks bkt bsb bsc bsd bsk bss bst btb btc btd btk bts btt c-- cbb cbc cbd cbk cbs cbt ccb ccc ccd cck ccs cct cdb cdc cdd cdk cds cdt ckb ckc ckd cks ckt csb csc csd csk css cst ctb ctc ctd ctk cts ctt dbb dbc dbd dbk dbs dbt dcb dcc dcd dck dcs dct ddb ddc ddd ddk dds ddt dkb dkc dkk dks dkt dsb dsc dsd dsk dss dst dtb dtc dtd dtk dts dtt k-t kbb kbc kbd kbk kbs kcb kcc kcd kck kcs kct kdb kdc kdk kds kdt kkb kkc kkk kks kkt ksb ksc ksd ksk kss kst ktb ktc ktk kts ktt sbb sbc sbd sbk sbs sbt scb scc scd sck scs sct sdb sdc sdd sdk sds sdt sk- skb skc skd skk sks skt ss- ssb ssc ssd ssk sss sst stb stc std stk sts stt tbb tbc tbd tbk tbs tbt tcb tcc tcd tck tcs tct tdb tdc tdd tdk tds tdt tkb tkc tkk tks tkt tsb tsc tsd tsk tss tst ttb ttc ttd ttk tts ttt