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MB3 121b: Smearing to Close a Hole in a Containers on Shabbos (314:11-12); Why Is Putting Up a Tent Forbidden on Shabbos (315:1)
Smearing wax or a similar substance to plug a hole in a container vis-a-vis the melacha prohibition of smearing (ממרח).
Building even a temporary tent is prohibited on Shabbos as a toldah of boneh as a safeguard against pitching a permanent tent. Hanging