| http://www.w3.org/ns/prov#value | - The upper tip may comprise a relatively soft material, such as a rubber or polymer foam, so that the rocket 4 easily withstands, without breaking the rocket 4, an impact with the ground after a launch of the rocket 4, and also so as to prevent or minimize any injury to a person should the rocket 4 fall on or impact the person after being launched.
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