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sage: v = vector(QQ, [1,1])
sage: w = vector(QQ, [3,3])
sage: v; w
(1, 1)
(3, 3)
sage: v = copy(w)
sage: v; w
(3, 3)
(3, 3)
sage: w = 22
sage: v; w
(3, 3)
22