How to get all text from format change revisions to a list of string in aspose word?

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how to get all text from format change revisions to a list of string in aspose word?
my sample code is mentioned below. here I need to load parentnode text into the list commons. but showing an error in line (s1.Item1.ParentNode.GetText())
how can I use and load it?

var docChangesList = new List<Tuple<Revision, string, string>>();

var groupedChangesList = docChangesList.Where(w => w.Item1.Group != null).GroupBy(u => u.Item1.Author).Select(grp => grp.ToList()).ToList();  

var commons = groupedChangesList[0].Select(s1 => new { s1.Item1.ParentNode.GetText(), s1.Item1.Group.RevisionType}).ToList().Intersect(groupedChangesList[1].Select(s2 => new { s2.Item1.ParentNode.GetText(), s2.Item1.Group.RevisionType }).ToList()).ToList();
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@vineeth.pv You can use code like this to achieve this:

Document doc = new Document(@"C:\Temp\in.docx");

foreach (RevisionGroup group in doc.Revisions.Groups)
{
    if (group.RevisionType == RevisionType.FormatChange)
        Console.WriteLine(group.Text);
}