We would like you to classify each of the following sets of argument pairs (discussing Gun Control) into either SIMILAR or NOT SIMILAR. A pair of arguments is considered SIMILAR if the arguments are about the same FACET (making the same argument), and is considered NOT SIMILAR if they do not have the same FACET. A FACET is a low level issue that often reoccurs in many arguments in support of the author's stance or in attacking the other author's position.

Sent1: DC doesn't need to have an age restriction on gun ownership, because no matter what their laws say, you still have to be at least 18 to pass a federal background check to buy a gun.
Sent2: No it's federal law that you have to run background checks in order to keep your FFL (federal firearms license) which allows you to legally sell guns.
Not similar

Sent1: In the dicta from a maritime law case the Supreme Court commented that state laws restricting concealed weapons do not infringe upon the right to bear arms protected by the Federal Second Amendment."
Sent2: (i.e. restrictions on concealed carry, laws against brandishing) but we can not ban the carrying of arms altogether since that would violate the second amendment.
Similar

Sent1: This appeared to me to be an argument that self defense cannot exist if a gun is used.
Sent2: Another point that isn't taken in consideration in the stats that I've seen is that guns are used in self-defense but it still goes down as "gun violence."
Not similar