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type Pather interface {
	// Cost indicates the move cost between a hex and one
	// of its neighbors. Higher values are less desirable.
	// Negative costs are treated as impassable.
	Cost(a hex.Hex, direction int) int

	// EstimatedCost returns the estimated cost between
	// two hexes that are not necessarily neighbors.
	// Negative costs are treated as impassable.
	EstimatedCost(a, b hex.Hex) int
}