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##### LM #####
lex
ignore /[ \t\n]+/
token id /[a-z0-9]+/
literal ',', '.', '*', '(', ')'
end
def bigger ['(' item* ')']
def item [id] | [bigger]
def lang [item*]
B: bigger = construct bigger "( b1 b2 )"
print( construct lang "a [B] c" '\n' )
##### EXP #####
a ( b1 b2 ) c
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