Since Set objects have a __as_immutable__() method returning an instance of ImmutableSet, it is possible to construct sets of sets. A similar mechanism is needed by the __contains__() and remove() methods which need to hash an element to check for membership in a set.
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Learn how to cut, weed and heat apply Siser Heat Transfer Vinyl using a vinyl cutter and heat press. 320 F or 160 C-LIGHT pressure-press for 10 seconds-hot peel.All Graphic Supplies offers a wide range of heat transfer products from Siser North America and Rite-Media.earn how to cut, weed and heat apply Siser Heat Transfer Vinyl using a vinyl cutter and heat press. 320 F or 160 C-LIGHT pressure-press for 10 seconds-hot peel.