-th bbb bbc bbe bbh bbk bbo bbs bbt bcb bcc bce bch bck bco bcs bct be- beb bec bee beh bek beo bes bet bhb bhc bhe bhh bhk bho bhs bht bkb bkc bke bkk bko bks bkt bob boc boe boh bok boo bos bot bsb bsc bse bsh bsk bso bss bst btb btc bte bth btk bto bts btt c-- cbb cbc cbe cbh cbk cbo cbs cbt ccb ccc cce cch cck cco ccs cct ce- ceb cec cee ceh cek ceo ces cet ch- chb chc che chh chk cho chs cht ckb ckc ckh cko cks ckt co- cob coc coe coh cok coo cos cot csb csc cse csh csk cso css cst ctb ctc cte cth ctk cto cts ctt ebb ebc ebe ebh ebk ebo ebs ebt ec- ecb ecc ece ech eck eco ecs ect eeb eec eee eek eeo ees eet ehb ehc ehe ehh eho ehs eht ekb ekc eke ekh eko eks ekt eo- eob eoc eoe eoh eok eoo eos eot es- esb esc ese esh esk eso ess est etb etc ete eth etk eto ets ett hbb hbc hbe hbh hbk hbo hbs hbt hcb hcc hce hch hck hco hcs hct he- heb hec hee heh hek heo hes het hhb hhc hhe hhh hhk hho hhs hht hkb hkh hkk hko hks hkt hob hoc hoe hoh hok hoo hos hot hsb hsc hse hsh hsk hss hst htb htc hte hth htk hto hts htt k-t kbb kbc kbe kbh kbk kbo kbs kcb kcc kce kch kck kcs kct ke- keb kec kee keh kek keo kes ket khe khh khk kho khs kkb kkc kke kkh kkk kks kkt kob koc koe koh kok koo kos kot ksb ksc kse ksh ksk kso kss kst ktb ktc kte kth ktk kto kts ktt ob- obb obc obe obh obk obo obs obt oc- ocb occ och ock oco ocs oct oeb oec oee oeh oeo oes oet ohc ohe ohh oho ohs oht okb okc oke okk oko oks oo- oob ooc ooh ook ooo oos oot os- osb osc ose osh osk oso oss ost ot- otb otc ote oth otk oto ots ott sbb sbc sbe sbh sbk sbo sbs sbt scb scc sce sch sck sco scs sct se- seb sec see seh sek seo ses set sh- shb shc she shh shk sho shs sht sk- skb skc ske skh skk sko sks skt sob soc soe soh sok soo sos sot ss- ssb ssc sse ssh ssk sso sss sst stb stc ste sth stk sto sts stt tbb tbc tbe tbh tbk tbo tbs tbt tcb tcc tce tch tck tco tcs tct te- teb tec tee teh tek teo tes tet th- thb thc the thh thk tho ths tht tkb tkc tke tkk tko tks tkt to- tob toc toe toh tok too tos tot tsb tsc tse tsh tsk tso tss tst ttb ttc tte tth ttk tto tts ttt