function Concatenate2d( mergedElements ) {

	// Concatenate2d inherits from abstract strategy "MergeStrategy2d".

	MergeStrategy2d.call( this, mergedElements );

	this.strategyType = "Concatenate2d";

}
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Functions below override base class MergeStrategy2d's abstract method

Concatenate2d overrides MergeStrategy2d's function:
getOutputShape, validate, getRelativeElements

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