Export Footnotes in Pages Range using Grep and Array Causing Exported Duplicates in text File!

@m1b @Robert at ID-Tasker , hi all, thanks a lot for your help and suggestions,  i create a new crazy method to fix this! and it works!, here it is :

//Export Footnotes in Pages Range
DoFootnotesRange();

function DoFootnotesRange(){
    
    //Array for the Collected Footnotes Text
    var myFoundTexts = [];
    //grep options
    app.findChangeGrepOptions.includeMasterPages = false; 
    app.findChangeGrepOptions.includeFootnotes = true; 
    app.findChangeGrepOptions.includeHiddenLayers = false; 
    app.findChangeGrepOptions.includeLockedLayersForFind = true; 
    app.findChangeGrepOptions.includeLockedStoriesForFind = true; 

    var myDoc = app.activeDocument;
    var pgStart = 0; 
    var pgEnd =  9;
    var myFind = "~F.+$";
    
    //Clear Grep Prefrences
    app.findGrepPreferences = app.changeGrepPreferences = null;
    app.findGrepPreferences.findWhat = myFind;

    try {
        var myDoc = app.activeDocument;
        } catch(e) { exit(); }
        var f = File("~/Desktop/Doc Exported Footnotes in Pages Range .txt");
        f.encoding = "UTF-8";
        f.open("w");

        
        //New Method for Pages Range!
        for (var n = pgStart; n <= pgEnd; n++) {
                var pageRange = myDoc.pages[n].textFrames.everyItem();
                var myFoundTextParagraphs = pageRange.findGrep();
                
        //First nested loop to grab all the found texts in Range of Paragraphs in Page Range
        //is an array of arrays. It's because of use of everyItem().
        for (var i = 0; i < myFoundTextParagraphs.length; i++) {
            for (var j = 0; j < myFoundTextParagraphs[i].length; j++) {
                myFoundTexts.push(myFoundTextParagraphs[i][j]);
                }
            }
        }
     
    //Now Loop to Show Found Text in Array
    for (var k = 0; k < myFoundTexts.length; k++) {
         f.writeln (myFoundTexts[k].contents+"\t"+myFoundTexts[k].parentTextFrames[0].parentPage.name)
        }
        app.findGrepPreferences = app.changeGrepPreferences = null;
        f.close();
        alert("Document Footnotes Exported to Desktop File", "Finished");  
}

i did it and it succeeded before for the all book , but the original complete book is near 180 pages and other book near 500 pages so i decide to make it in range!, and no need to sort them, i start thinking to import text file inside indesign and removing duplicates via grep or make a new script for that, thank for your suggestion

@Robert at ID-Tasker, the result of

myDoc.pages.itemByRange(pgStart, pgEnd).textFrames.everyItem().paragraphs.everyItem().findGrep();

is an array of arrays. It's because of the use of everyItem().

- Mark