Commentary for Ketubot 166:6
רבי יהודה אומר לעולם הוא אוכל פירי פירות: תנו רבנן אלו הן פירות ואלו הן פירי פירות הכניסה לו קרקע ועשתה פירות הרי הן פירות מכר פירות ולקח מהן קרקע ועשתה פירות הרי הן פירי פירות
R. Judah says: In all cases she may benefit from the usufruct of the usufruct [etc.]. Our Rabbis taught: The following are regarded as usufruct and the following as the usufruct of the usufruct. If a woman brought to her husband a plot of land and it yielded produce, this is usufruct. If he sold the produce and purchased land with the proceeds and that land yielded produce, this is regarded as the usufruct of the usufruct.
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