There are only 4 basic ways that no two Es come together. They are 1. _ E _ E _ E 2. E _ _ E _ E 3. E _ E _ _ E 4. E _ E _ E _ where the letters C, H and S fill the blanks. For each of those 4 ways we can arrange the C, H and S in the 3 blanks in 3! ways. Answer (4)(3!) = (4)(6) = 24 ways. Edwin