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allison committed ced0802

Add the comments from the original.

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Spix/PEG/Parser.peg

+# Hierarchical syntax
 Grammar    <- Spacing Definition+ EndOfFile
 Definition <- Identifier LEFTARROW Expression
 Expression <- Sequence (SLASH Sequence)*
             / OPEN Expression CLOSE
             / Literal / Class / DOT
 
+# Lexical syntax
 Identifier <- IdentStart IdentCont* Spacing
 IdentStart <- [a-zA-Z_]
 IdentCont  <- IdentStart / [0-9]