:n = 0

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

	|start: {a}

	a!insert(c)

	n += 1

	|before recursion {c}: {a}

	if(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}

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

		|after recursion {c}: {a}

|pass list:

n = 0
g!