n=-1
z=0
move(dz) = {
	z+=dz;
	print (n++ " " imag(z));
}

iter(d) = {
	if (d==0,
			move(1),

			d--;
			iter(d);
			for (k=1, 2^d, move(I-1));
			iter(d);
			for (k=1, 2*2^d, move(-I));
			iter(d);
			for (k=1, 2^d, move(I-1));
			iter(d);
	);
}

move(0)
iter(6)

quit