BEGIN {

	f(0, a) # nothing

	f(1, a)

}

function f(i, a) {

	if (i == 0) return

	g(a, a)

	pr(a)

}

function g(x, y) {

	h(y, x, y)

}

function h(b, c, d) {

	b[1] = 1

	c[1] = 2 # rewrite

	print b[1], d[1]

	c[2] = 1

	b[2] = 2 # should rewrite

}

function pr(x) {

	print x[1], x[2]

}