Assertion: metallic balloon | /r/HasProperty | tied by string
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Source sentences:
text: Because metallic balloons can cause power outages like on overhead catenary train lines, it is recommended that the metallic balloons not only be tied by a string or ribbon with no metal in it, but also securely tied down by a weight to prevent the balloon from floating away and some train operators either issue advisories on how to handle balloons or ban balloons altogether.