To get started with Elm PEG Parser, you first need to define a PEG Grammar using the Grammar type.
type alias Grammar = List ( String, Rule )
Represents a PEG grammar as a list of rules, each consisting of a name and a corresponding Rule value.
The Rule value should be a valid PEG grammar rule that can be parsed by the fromString function.
See fromString code 
for an example of how to create a Grammar from a string representation of a PEG grammar.
Once you have defined your grammar, you can use the parse function to parse input text using the grammar.
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