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Then the next marker in the lifespan--
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so think of there being a timeline here,
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and at the beginning of the timeline
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is the birth and manufacturer of the gun,
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then there's the sale of the gun--
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the next marker in this fictional lifespan of the gun
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is the possession of the gun or the carrying of the gun.
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Then let's have as the last marker
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in this fictional lifespan of the gun,
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the use of the gun or the pulling of the trigger.
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You could have policy
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that addresses these different markers in the lifespan of the gun.