autocomplete How to avoid duplicate selection

I am using JQuery autocomplete. In which i want to avoid duplicate selection of pre-selected and pre-located (pre fetched) list.

The following script works with currently selected list. But how can I do it with pre-located list which are fetched with document onload.

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JS

$(document).on('focus','.search',function(){
let type = $(this).data('type');

$(this).autocomplete({
    source: function( request, response ) {
        $.ajax({
            url : 'autocomplete.php',
            dataType: "json",
            method: 'post',
            data: {
               name_startsWith: request.term,
               type: type
            },
            success: function( data ) {
            let selected = [],
               uniques = [],
               choices = [];

            $('tr .search[id^="name_"]').each(function(){
             let value = this.value.trim().toLowerCase();
             if (value && selected.indexOf(value) < 0) {
               selected.push(value);
             }
           });

           data.forEach(item => {
             let value = item.name.trim().toLowerCase();

             if (uniques.indexOf(value) < 0 && selected.indexOf(value) < 0) {
               choices.push({
                 label: item.name,
                 value: item.name,
                 data: item,
                 type: 'name'
               });
               uniques.push(value);
             }

           });

           response(choices);
        }
    });
},
autoFocus: true,
minLength: 1,
select: function( event, ui ) {
    // Strips the 'team_' part, leaving just the number.
    let id_num = $(this).attr('id').substring(5);

    $(this).val(ui.item.value);
    $('#id_' + id_num).val(ui.item.data.id).change();
    $('#marks_' + id_num).val(ui.item.data.marks);
    $(this).attr('data-type', ui.item.type); 
    return false;
},
appendTo: $(this).parent()
});
});    

HTML

<table class="table table-bordered table-hover" id="pat_tests">
                            <thead>
                                <tr>
                                    <th>ID</th>
                                    <th>Name</th>
                                    <th>Marks</th>
                                </tr>
                            </thead>
                            <tbody>
                                <tr>
                                    <td> <input type="number" id="id_1"> </td>
                                    <td><input type="text" id="name_1" class="search" data-type="type"></td>                                    
                                    <td><input type="number" id="marks_1" ></td>
                                </tr>
                                <tr>
                                    <td> <input type="number" id="id_2"> </td>
                                    <td><input type="text" id="name_2" class="search" data-type="type"></td>                                    
                                    <td><input type="number" id="marks_2" ></td>
                                </tr>
                                <tr>
                                    <td> <input type="number" id="id_3"> </td>
                                    <td><input type="text" id="name_3" class="search" data-type="type"></td>                                    
                                    <td><input type="number" id="marks_3" ></td>
                                </tr>
                            </tbody>
                        </table>

                        <h2>Pre Selected List of Students</h2>
                        <p class="selected">Mario</p>
                        <p class="selected">Nico"</p>
                        <p class="selected">Mento</p>

PHP

if(!empty($_POST['type'])){
$type = $_POST['type'];
$name = $_POST['name_startsWith'];
$query = $db->prepare("SELECT id, name, marks FROM class where (name LIKE '".$name."%') ");
$query->execute();
$data = array();

$i = 0;
while ($row = $query->fetch(PDO:: FETCH_ASSOC)) {

    $data[$i]['id'] = $row['id'];
    $data[$i]['name'] = $row['name'];
    $data[$i]['marks'] = $row['marks'];
++$i;
}  
echo json_encode($data);

from autocomplete How to avoid duplicate selection