We would like you to assess the QUALITY of each of the following argument (discussing Gun Control) 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 gun control. An invalid argument is a phrase that cannot be interpreted as an argument or not on the topic of gun control.

Ex Input:
The legal market for firearms gets killed off in hopes of hindering criminals, and instead the criminals continue buying from the black market, importing them illegally, or making their weapons themselves.

Ex Output:
Valid

Ex Input:
Under English common law, the Castle Doctrine was intended to be a narrow exception to the general duty to retreat.

Ex Output:
Invalid

Ex Input:
The majority of them can only be used if the firearm is already unloaded and the action is open, meaning a person can't accidentally shoot themselves or another to begin with.

Ex Output:
Valid