Rewrite the following argument using letters to represent the terms, reduce the number of terms, and put the argument into standard form. Then test the new forms with Venn diagrams or by means of the five rules for syllogism to determine the validity or invalidity of the original argument.
Some unintentional killings are not punishable offenses, inasmuch as all cases of self-defense are unpunishable offenses, and some intentional killings are cases of self-defense.