Assertion: serial killer's murder | /r/DefinedAs | a minimum of four victims
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Source sentences:
text: While the fact that the amount of active serial killers in the U.S. has dropped substantially over the last few decades might sound like a relief, the grim reality is that it could be due to the fact mass murder (defined by a minimum of four victims, in a short period of time) has simply become more common, as a result of the widespread availability of guns.