bbb bbc bbd bbe bbk bbo bbs bbt bcb bcc bcd bce bck bco bcs bct bdb bdc bdd bde bdk bdo bds bdt be- beb bec bed bee bek beo bes bet bkb bkc bke bkk bko bks bkt bob boc bod boe bok boo bos bot bsb bsc bsd bse bsk bso bss bst btb btc btd bte btk bto bts btt c-- cbb cbc cbd cbe cbk cbo cbs cbt ccb ccc ccd cce cck cco ccs cct cdb cdc cdd cde cdk cdo cds cdt ce- ceb cec ced cee cek ceo ces cet ckb ckc ckd cko cks ckt co- cob coc cod coe cok coo cos cot csb csc csd cse csk cso css cst ctb ctc ctd cte ctk cto cts ctt dbb dbc dbd dbe dbk dbo dbs dbt dcb dcc dcd dce dck dco dcs dct ddb ddc ddd dde ddk ddo dds ddt de- deb dec ded dee dek deo des det dkb dkc dke dkk dko dks dkt dob doc dod doe dok doo dos dot dsb dsc dsd dse dsk dso dss dst dtb dtc dtd dte dtk dto dts dtt ebb ebc ebd ebe ebk ebo ebs ebt ec- ecb ecc ecd ece eck eco ecs ect ed- edb edc edd ede edk edo eds edt eeb eec eed eee eek eeo ees eet ekb ekc ekd eke eko eks ekt eo- eob eoc eod eoe eok eoo eos eot es- esb esc esd ese esk eso ess est etb etc etd ete etk eto ets ett k-t kbb kbc kbd kbe kbk kbo kbs kcb kcc kcd kce kck kcs kct kdb kdc kde kdk kdo kds kdt ke- keb kec ked kee kek keo kes ket kkb kkc kke kkk kks kkt kob koc kod koe kok koo kos kot ksb ksc ksd kse ksk kso kss kst ktb ktc kte ktk kto kts ktt ob- obb obc obd obe obk obo obs obt oc- ocb occ ocd ock oco ocs oct odb odc odd ode odo ods odt oeb oec oed oee oeo oes oet okb okc okd oke okk oko oks oo- oob ooc ood ook ooo oos oot os- osb osc osd ose osk oso oss ost ot- otb otc otd ote otk oto ots ott sbb sbc sbd sbe sbk sbo sbs sbt scb scc scd sce sck sco scs sct sdb sdc sdd sde sdk sdo sds sdt se- seb sec sed see sek seo ses set sk- skb skc skd ske skk sko sks skt sob soc sod soe sok soo sos sot ss- ssb ssc ssd sse ssk sso sss sst stb stc std ste stk sto sts stt tbb tbc tbd tbe tbk tbo tbs tbt tcb tcc tcd tce tck tco tcs tct tdb tdc tdd tde tdk tdo tds tdt te- teb tec ted tee tek teo tes tet tkb tkc tke tkk tko tks tkt to- tob toc tod toe tok too tos tot tsb tsc tsd tse tsk tso tss tst ttb ttc ttd tte ttk tto tts ttt