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FInd duplicates on output

I submit some data via AJAX post and when I get receive response I output it via a loop.

$.each(data, function() {
    $("#em").append('<i class="bi bi-pin-map-fill'+(lat == this.lat && lon == this.lon ? " bg-danger" : "")+'"></i> '+this.lat+' '+this.lon);

    let lat = this.lat,
        lon = this.lon;
}

In some case the coordinates I receive could be of the exact same location, so I'd like to be able to mark those duplicates by adding background color. So I've added a condition to check for matches but am blanking how to implement it, since I can't really set the vars at the end of my loop... Need some nudge in the right direction.

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