-ol bbb bbc bbd bbk bbl bbo bbs bbt bcb bcc bcd bck bcl bco bcs bct bdb bdc bdd bdk bdl bdo bds bdt bkb bkc bkk bkl bko bks bkt blb blc bld blk bll blo bls blt bob boc bod bok bol boo bos bot bsb bsc bsd bsk bsl bso bss bst btb btc btd btk btl bto bts btt c-- cbb cbc cbd cbk cbl cbo cbs cbt ccb ccc ccd cck ccl cco ccs cct cdb cdc cdd cdk cdl cdo cds cdt ckb ckc ckd cko cks ckt cl- clb clc cld clk cll clo cls clt co- cob coc cod cok col coo cos cot csb csc csd csk csl cso css cst ctb ctc ctd ctk ctl cto cts ctt dbb dbc dbd dbk dbl dbo dbs dbt dcb dcc dcd dck dcl dco dcs dct ddb ddc ddd ddk ddl ddo dds ddt dkb dkc dkk dkl dko dks dkt dl- dlb dlc dld dlk dll dlo dls dlt dob doc dod dok dol doo dos dot dsb dsc dsd dsk dsl dso dss dst dtb dtc dtd dtk dtl dto dts dtt k-t kbb kbc kbd kbk kbl kbo kbs kcb kcc kcd kck kcl kcs kct kdb kdc kdk kdl kdo kds kdt kkb kkc kkk kkl kks kkt kl- klb klc kld klo kls klt kob koc kod kok kol koo kos kot ksb ksc ksd ksk ksl kso kss kst ktb ktc ktk ktl kto kts ktt lbb lbc lbd lbk lbl lbo lbs lbt lcb lcc lcd lck lcl lco lcs lct ldb ldc ldd ldk ldl ldo lds ldt lkb lkl lks lkt llb llc lld llk lll llo lls llt lob loc lod lok lol loo los lot lsb lsc lsd lsk lsl lso lss lst ltb ltc ltd ltk ltl lto lts ltt ob- obb obc obd obk obl obo obs obt oc- ocb occ ocd ock ocl oco ocs oct odb odc odd odl odo ods odt okb okc okd okk okl oko oks olb olc old olk oll olo ols olt oo- oob ooc ood ook ool ooo oos oot os- osb osc osd osk osl oso oss ost ot- otb otc otd otk otl oto ots ott sbb sbc sbd sbk sbl sbo sbs sbt scb scc scd sck scl sco scs sct sdb sdc sdd sdk sdl sdo sds sdt sk- skb skc skd skk skl sko sks skt slb slc sld slk sll slo sls slt sob soc sod sok sol soo sos sot ss- ssb ssc ssd ssk ssl sso sss sst stb stc std stk stl sto sts stt tbb tbc tbd tbk tbl tbo tbs tbt tcb tcc tcd tck tcl tco tcs tct tdb tdc tdd tdk tdl tdo tds tdt tkb tkc tkk tkl tko tks tkt tlc tld tlk tll tlo tls tlt to- tob toc tod tok tol too tos tot tsb tsc tsd tsk tsl tso tss tst ttb ttc ttd ttk ttl tto tts ttt