Generate a python program that has the following intention:

The intention of the program is to check whether a given list of characters representing parenthesis expressions is valid or not. The function is_valid_parenthesization takes a list of characters as input, and checks if the number of opening parentheses ('(') is equal to the number of closing parentheses (')'). If the count of opening and closing parentheses is equal, the function returns True, indicating a valid parentheses expression. Otherwise, it returns False. There should be exactly 5 paragraphs separated by the markdown divider: ***.
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