c-- ccc cce ccf cch cck cco ccs ce- cec cee cef ceh cek ceo ces cfc cfe cff cfh cfk cfo cfs ch- chc che chf chh chk cho chs ckc ckh cko cks co- coc coe cof coh cok coo cos csc cse csf csh csk cso css ec- ecc ece ecf ech eck eco ecs eec eee eef eek eeo ees ef- efc efe eff efh efo efs ehc ehe ehf ehh eho ehs ekc eke ekf ekh eko eks eo- eoc eoe eof eoh eok eoo eos es- esc ese esf esh esk eso ess fcc fce fcf fck fco fcs fec fee fef feh fek feo fes ffc ffe fff ffh ffk ffo ffs fhc fhe fhf fhh fho fhs fkc fkf fkk foc foe fof foh fok foo fos fsc fse fsf fsh fsk fso fss hcc hce hcf hch hck hco hcs he- hec hee hef heh hek heo hes hfc hfe hff hfh hfk hfo hfs hhc hhe hhf hhh hhk hho hhs hkf hkh hkk hko hks hoc hoe hof hoh hok hoo hos hsc hse hsf hsh hsk hss kcc kce kch kck kcs ke- kec kee kef keh kek keo kes kfc kff kfh kfo kfs khe khf khh khk kho khs kkc kke kkh kkk kks koc koe kof koh kok koo kos ksc kse ksf ksh ksk kso kss oc- occ ocf och ock oco ocs oec oee oef oeh oeo oes of- ofc ofe off ofo ofs ohc ohe ohf ohh oho ohs okc oke okk oko oks oo- ooc oof ooh ook ooo oos os- osc ose osf osh osk oso oss scc sce scf sch sck sco scs se- sec see sef seh sek seo ses sfc sfe sff sfh sfk sfo sfs sh- shc she shf shh shk sho shs sk- skc ske skf skh skk sko sks soc soe sof soh sok soo sos ss- ssc sse ssf ssh ssk sso sss