bbb bbc bbd bbe bbs bcb bcc bcd bce bcs bdb bdc bdd bde bds be- beb bec bed bee bes bsb bsc bsd bse bss c-- cbb cbc cbd cbe cbs ccb ccc ccd cce ccs cdb cdc cdd cde cds ce- ceb cec ced cee ces csb csc csd cse css dbb dbc dbd dbe dbs dcb dcc dcd dce dcs ddb ddc ddd dde dds de- deb dec ded dee des dsb dsc dsd dse dss ebb ebc ebd ebe ebs ec- ecb ecc ecd ece ecs ed- edb edc edd ede eds eeb eec eed eee ees es- esb esc esd ese ess sbb sbc sbd sbe sbs scb scc scd sce scs sdb sdc sdd sde sds se- seb sec sed see ses ss- ssb ssc ssd sse sss