Choose the set of figures which follows the given rule.
Rule: The series becomes complex as it proceeds.
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Rule: Any figure can be traced by a single unbroken line without retracting.
Rule: Closed figures losing their sides and open figures gaining their sides.
Rule: Closed figures become more and more open and open figures become more and more closed.
Find out which of the figures (1), (2), (3) and (4) can be formed from the pieces given in figure (X).