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.

Ex Input:
Societies define marriage, because they find it a valuable institution for many reasons, such as raising children, providing financial and legal protection for families, and other such good things.

Ex Output:
Valid


Ex Input:
And, going back to the general topic of this thread; even if homosexuality is completely genetic and unchangable it doesn't follow that we should recognize a homosexual marriage as deserving of equal priviledge as a heterosexual one.

Ex Output:
Valid


Ex Input:
There may individuals who personally differ, of course, but their opinions are not based on evidence.

Ex Output:

Invalid