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: The usual reason given for banning first-cousin marriage is because there is a risk of offspring of first cousins having biological problems.
Example Output: Valid

Example Input: Well, if that's a reason to ban homosexuals from marriage, then along the same line of thought, then any couple that is infertile or chooses not to have children should not be permitted to get married.
Example Output: Valid

Example Input: But the question of whether inter-racial marriages must be recognized by law and whether same-sex marriages must be recognized by law are still different questions, and each must be evaluated on its own merits.
Example Output:
Valid