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Shiur 1 of 11 on the topic of waterbugs in New York City's water.
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Shiur 2 of 11 on the topic of waterbugs in New York City's water.
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Shiur 3 of 11 on the topic of waterbugs in New York City's water.
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Shiur 4 of 11 on the topic of waterbugs in New York City's water.
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Shiur 5 of 11 on the topic of waterbugs in New York City's water.
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