11. Choose the set of figures which follows the given rule.
Rule: Closed figures gradually become open and open figures gradually become closed.
Rule: Closed figures gradually become open and open figures gradually become closed.
12. Choose the set of figures which follows the given rule.
Rule: Any figure can be traced by a single unbroken line without retracing.
Rule: Any figure can be traced by a single unbroken line without retracing.