:@choice = 1
:i = "i"!script($_)
	| a |>
		|-> a
		#p!checkpoint
		| aa |>
			|-> aa
		| ab |>
			|-> ab
	| b |>
		|-> b
	if(1)
		| c |>
			|-> c

| i:
i!

| i from #p:
i!from(#p)