We would like you to assess the QUALITY of each of the following argument (discussing Gay Marriage) and determine if the argument is Valid or Invalid. A valid argument is clearly interpretable and either expresses an argument, or a premise or a conclusion that can be used in an argument for the topic of gay marriage. An invalid argument is a phrase that cannot be interpreted as an argument or not on the topic of gay marriage.

Example Input: Now, my question is if you believe that same sex marriage is wrong, then do you think pedophiles and convicted rapist should still have the right to marry?
Example Output: Valid

Example Input: We further believe that legal recognition and the accompanying benefits afforded couples should be preserved for that unique and special union of one man and one woman which has historically been called marriage.
Example Output: Valid

Example Input: If mental illness is a myth, the critics argue, so is physical illness[citation needed], because both categories have fuzzy boundaries and are to a large extent culturally determined.
Example Output:
Invalid

