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Correct Parent Parser errors in README.md
* Rename parent_parser -> surface_parser * The second constructor argument is a string.
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@ -799,8 +799,8 @@ A parser may use arguments that could be used by other parsers.
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These shared arguments can be added to a parser which is then used as a "parent" for parsers which also need those arguments. One or more parent parsers may be added to a parser with `.add_parents`. The positional and optional arguments in each parent is added to the child parser.
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```cpp
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argparse::ArgumentParser surface_parser("surface", 1.0, argparse::default_arguments::none);
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parent_parser.add_argument("--area")
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argparse::ArgumentParser surface_parser("surface", "1.0", argparse::default_arguments::none);
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surface_parser.add_argument("--area")
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.default_value(0)
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.scan<'i', int>();
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