Rule: Closed figures gradually become open and open figures gradually become closed.
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.
Rule: The series becomes complex as it proceeds.
Rule: Closed figures become more and more open and open figures become more and more closed.
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