Reference for Ketubot 166:7

איבעיא להו לרבי יהודה פירי פירות דוקא או דלמא עד עולם דוקא או דלמא תרוייהו דוקא

The question was raised: According to R. Judah, [is the expression] “the usufruct of the usufruct” the essential phrasing, or is “without end” essential, or perhaps both are essential?

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