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#lang yaragg
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top : w | x | y | z | a | b | c
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w : /"w" ; atom
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x : /("x") ; seq
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y : /("y" "y") ; seq
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z : /("w" | "z") ; choice
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a : /["a"] ; opt
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b : /(["b"] "b") ; opt in seq
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c : /"c"+ ; repeat |