Commentary for Sukkah 37:16

ומי איכא מידי דאצטרופי מצטרף והוא עצמו אינו כשר אמר רבי יצחק בן אלישב אין

But is there anything which itself is invalid and yet combines [with another thing to become valid]? R. Isaac b. Elyashiv answered, Yes!

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