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# It is permitted to spread a bed sheet even if it hangs over the side of the bed. <Ref>Mishna Brurah 315:31, Shemirat [[Shabbat]] KeHilchata 24:25 </ref># It is forbidden to put together a crib on [[Shabbat]]. <ref>Shemirat [[Shabbat]] KeHilchata 24:23 </ref>===Concrete===# It is forbidden to pour water on concrete on Shabbat in order to harden it even if one is pouring the water for another purpose like washing one's hands and beneath there is concrete that needs to be hardened. The best option is to use a timer. A worse alternative is to ask a non-Jew to do it using grama, such as pouring the water into a vessel near the concrete which when it overflows spills onto the concrete.<ref>Chazon Ovadia v. 5 p. 277</ref>
==Building a wall==

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