Callback cb0;
	Callback1<double> cb1;
	Callback2<double, double> cb2;
	Callback3<double, double, double> cb3;
	Callback4<double, double, double, double> cb4;

	Gate gt0;
	Gate1<double> gt1;
	Gate2<double, double> gt2;
	Gate3<double, double, double> gt3;
	Gate4<double, double, double, double> gt4;
	
	//args reduction

	//1 arg to 0 args
	cb0 = callback1(cb1, 1);
	
	//2 args to 1 arg
	cb1 = callback1(cb2, 2);
	cb0 = callback2(cb2, 1, 2);

	//3 args to 2 args
	cb2 = callback1(cb3, 3); //new
	cb0 = callback3(cb3, 1, 2, 3); //new

	//4 args to 3 args
	cb3 = callback1(cb4, 4); //new
	cb0 = callback4(cb4, 1, 2, 3, 4); //new



	//1 arg to 0 args
	gt0 = callback1(gt1, 1); //new
	
	//2 args to 1 arg
	gt1 = callback1(gt2, 2); //new
	gt0 = callback2(gt2, 1, 2); //new

	//3 args to 2 args
	gt2 = callback1(gt3, 3); //new
	gt0 = callback3(gt3, 1, 2, 3); //new

	//4 args to 3 args
	gt3 = callback1(gt4, 4); //new
	gt0 = callback4(gt4, 1, 2, 3, 4); //new