c-- ccc cce ccf cch cck ccs ce- cec cee cef ceh cek ces cfc cfe cff cfh cfk cfs ch- chc che chf chh chk chs ckc ckh cks csc cse csf csh csk css ec- ecc ece ecf ech eck ecs eec eee eef eek ees ef- efc efe eff efh efs ehc ehe ehf ehh ehs ekc eke ekf ekh eks es- esc ese esf esh esk ess fcc fce fcf fck fcs fec fee fef feh fek fes ffc ffe fff ffh ffk ffs fhc fhe fhf fhh fhs fkc fkf fkk fsc fse fsf fsh fsk fss hcc hce hcf hch hck hcs he- hec hee hef heh hek hes hfc hfe hff hfh hfk hfs hhc hhe hhf hhh hhk hhs hkf hkh hkk hks hsc hse hsf hsh hsk hss kcc kce kch kck kcs ke- kec kee kef keh kek kes kfc kff kfh kfs khe khf khh khk khs kkc kke kkh kkk kks ksc kse ksf ksh ksk kss scc sce scf sch sck scs se- sec see sef seh sek ses sfc sfe sff sfh sfk sfs sh- shc she shf shh shk shs sk- skc ske skf skh skk sks ss- ssc sse ssf ssh ssk sss