:l = [1]

:n = 0

$ f(t)
	~ t!insert(len(l)+1)

	f1: {l} {t}

	CHECK
	§ c

	~ n < 1
		REC

		~ n += 1
		~ f(t)

		END REC

	~ t!insert(len(t)+1)

	f2: {l}

~ f(l)

FINAL

l: {l}