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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