c-- ccc cce ccf cch cck cco ce- cec cee cef ceh cek ceo cfc cfe cff cfh cfk cfo ch- chc che chf chh chk cho ckc ckh cko co- coc coe cof coh cok coo ec- ecc ece ecf ech eck eco eec eee eef eek eeo ef- efc efe eff efh efo ehc ehe ehf ehh eho ekc eke ekf ekh eko eo- eoc eoe eof eoh eok eoo fcc fce fcf fck fco fec fee fef feh fek feo ffc ffe fff ffh ffk ffo fhc fhe fhf fhh fho fkc fkf fkk foc foe fof foh fok foo hcc hce hcf hch hck hco he- hec hee hef heh hek heo hfc hfe hff hfh hfk hfo hhc hhe hhf hhh hhk hho hkf hkh hkk hko hoc hoe hof hoh hok hoo kcc kce kch kck ke- kec kee kef keh kek keo kfc kff kfh kfo khe khf khh khk kho kkc kke kkh kkk koc koe kof koh kok koo oc- occ ocf och ock oco oec oee oef oeh oeo of- ofc ofe off ofo ohc ohe ohf ohh oho okc oke okk oko oo- ooc oof ooh ook ooo