c-- ccc cce ccf cch ccs ce- cec cee cef ceh ces cfc cfe cff cfh cfs ch- chc che chf chh chs csc cse csf csh css ec- ecc ece ecf ech ecs eec eee eef ees ef- efc efe eff efh efs ehc ehe ehf ehh ehs es- esc ese esf esh ess fcc fce fcf fcs fec fee fef feh fes ffc ffe fff ffh ffs fhc fhe fhf fhh fhs fsc fse fsf fsh fss hcc hce hcf hch hcs he- hec hee hef heh hes hfc hfe hff hfh hfs hhc hhe hhf hhh hhs hsc hse hsf hsh hss scc sce scf sch scs se- sec see sef seh ses sfc sfe sff sfh sfs sh- shc she shf shh shs ss- ssc sse ssf ssh sss