lex
	ignore /space+/
	literal `* `( `)
	token id /[a-zA-Z_]+/
end

def item 
	[id]
|	[`( item* `)]

def item2
	[id]
|	[`( item2* `)]

def start 
	[item*]

parse Item2: item2 "b

parse Input1: start "a [Item2] c d
print[ @Input1 ]

parse_tree Input2: start "a [Item2] c d
print[ @Input2 "\n" ]
######### EXP #########
a b c d
NIL