Assertion: knock | /r/HasProperty | term
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Source sentences:
text: Roof knocking (Hebrew: הקש בגג) or "knocks on the roof" is a term used by the Israel Defense Forces (IDF) to describe its practice of dropping non-explosive or low-yield devices on the roofs of targeted civilian homes in the Palestinian territories as a prior warning of imminent bombing attacks to give the inhabitants time to flee the attack.