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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 aima.core.agent.Action;

/**
 * Returns one for every action.
 * 
 * @author Ravi Mohan
 */
public class DefaultStepCostFunction implements StepCostFunction {

	public double c(Object stateFrom, Action action, Object stateTo) {
		return 1;
	}
}