Rif Succah 10a {Succah 20b continues; 21b - 22a}

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10a

{Succah 20b continues}
Gemara:
Shmuel explained: by a bed which is ten handbreadths high, for since it is ten handbreadths high, which is the measure of a succah, it is as if it is a succah within a succah and therefore he does not fulfil his obligation.

{Succah 21b}
Mishna:
One who supports his succah with a bedstead -- Rabbi Yehuda says: If it is unable to stand by itself it is invalid.

Gemara:
Abaye said: They only said this where it was supported {by the bedstead}. But if he placed schach upon a bed it is valid.

{Succah 22a}
Mishna:
A Succah covered thinly,