##### LM #####
lex
	token id / 'a' .. 'z' /
	ignore / '\n' | '\t' | ' ' /
end

def start
	[id*]

parse P: start[stdin]
Start: start = P.tree
for Id: id in triter(Start)
	print( Id '\n' )
##### IN #####
d e f
##### EXP #####
d
e
f