Assertion: hydrogen bomb's yield | /r/HasProperty | more than twice
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Source sentences:
text: Its yield was more than twice what had been expected, and was the largest ever American detonation.
text: Boosted by the nuclear fusion reaction in lithium-7, the yield of 15 megatonnes of TNT (63 PJ) was more than twice what had been expected, and indeed was the largest detonation the Americans would ever carry out.