:n = 0

$ f(c=1)
	:a = []

	start: {a}

	~ a!insert(c)

	~ n += 1

	before recursion {c}: {a}

	~ n < 5
		~ f(c+1)

		after recursion {c}: {a}

new list each time:

~ f

$ g(c=1, a=[])
	start: {a}

	~ a!insert(c)

	~ n += 1

	before recursion {c}: {a}

	~ n < 5
		~ g(c+1, a)

		after recursion {c}: {a}

pass list:

~ n := 0
~ g