This fails to parse, with _System.FormatException: Input string was not in a correct format_ being thrown: ```csharp MathParser parser = new MathParser(); parser.Operators.Add("λ", (left, right) => Math.Pow(left, right)); Assert.AreEqual(Math.Pow(3, 2), parser.Parse("3λ2")); ``` However, if the last statement is changed to have whitespace in the expression, it parses correctly: ```csharp Assert.AreEqual(Math.Pow(3, 2), parser.Parse("3 λ 2")); ```
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