Assertion: shepherd's sheep | /r/HasProperty | exposed at the level of ld20
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Source sentences:
text: That means that 3,000 sheep had to be exposed at the level of LD100, or 6,000 sheep had to be exposed at the level of LD50, or all 15,000 sheep had to be exposed at the level of LD20, or some similar combination of factors had to occur.