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.

Input: Consider 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.

Output: Invalid


Input: Consider Input: There have also been no scientifically documeted cases of gays changing their sexual orientation anymore than straights becoming gay.

Output: Valid


Input: Consider Input: The fact ex-gays may be just suppressing their desires, never changing to "heterosexual" at all is UNRELATED to genetics.


Output: Valid