:@choice=1
:g = "g"!script($_)
	*| a
		|-> a
		#p!checkpoint
		*| aa
			|-> aa
		*| ab
			|-> ab
	*| b
		|-> b
	choice = 2
	|autoflush
	*| c
		|-> c
	choice = 1

| g:
g!

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