Moving an Item which is a Base ["Basis"] for another Item, on Shabbat

Moving an item which is a base for something one may not move: Shabbat 117a, 125a-b, 142a-143a
Moving an item which is a base for something one may not move, and something one may move: Shabbat 117a, 142a
Differentiating in the Above case between movement of the item for use of something in it, or for use of its space: Shabbat 142a, 142b
Placing a permitted item on a forbidden item, in order to permit carrying the forbidden item to a safe place: Shabbat 142b
Whether forgetting a prohibited item on something renders the lower item a "base": Shabbat 120b, 125b, 142b [3x]
Whether placing a prohibited item on something renders the lower item a "base": Shabbat 120b, 125b, 142b [3x]
Specifically moving the permitted item rather than move the prohibited one, even though in either case the prohibited item will be moved: Shabbat 142b

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