bbb bbc bbd bbe bbo bbs bcb bcc bcd bce bco bcs bdb bdc bdd bde bdo bds be- beb bec bed bee beo bes bob boc bod boe boo bos bsb bsc bsd bse bso bss c-- cbb cbc cbd cbe cbo cbs ccb ccc ccd cce cco ccs cdb cdc cdd cde cdo cds ce- ceb cec ced cee ceo ces co- cob coc cod coe coo cos csb csc csd cse cso css dbb dbc dbd dbe dbo dbs dcb dcc dcd dce dco dcs ddb ddc ddd dde ddo dds de- deb dec ded dee deo des dob doc dod doe doo dos dsb dsc dsd dse dso dss ebb ebc ebd ebe ebo ebs ec- ecb ecc ecd ece eco ecs ed- edb edc edd ede edo eds eeb eec eed eee eeo ees eo- eob eoc eod eoe eoo eos es- esb esc esd ese eso ess ob- obb obc obd obe obo obs oc- ocb occ ocd oco ocs odb odc odd ode odo ods oeb oec oed oee oeo oes oo- oob ooc ood ooo oos os- osb osc osd ose oso oss sbb sbc sbd sbe sbo sbs scb scc scd sce sco scs sdb sdc sdd sde sdo sds se- seb sec sed see seo ses sob soc sod soe soo sos ss- ssb ssc ssd sse sso sss