Choose the set of figures which follows the given rule.
Rule: Closed figures losing their sides and open figures gaining their sides.
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Rule: Closed figures become more and more open and open figures become more and more closed.
Choose a figure which would most closely resemble the unfolded form of Figure (Z).
Find out which of the figures (1), (2), (3) and (4) can be formed from the pieces given in figure (X).