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AIMA-Java Core Algorithms from the book Artificial Intelligence a Modern Approach 3rd Ed.

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package aima.core.search.framework.problem;

import java.util.Set;

import aima.core.agent.Action;

/**
 * Artificial Intelligence A Modern Approach (3rd Edition): page 67.

 * 

 * Given a particular state s, ACTIONS(s) returns the set of actions that can be
 * executed in s. We say that each of these actions is applicable in s.
 * 
 * @author Ciaran O'Reilly
 * 
 */
public interface ActionsFunction {
	/**
	 * Given a particular state s, returns the set of actions that can be
	 * executed in s.
	 * 
	 * @param s
	 *            a particular state.
	 * @return the set of actions that can be executed in s.
	 */
	Set actions(Object s);
}