Group last catch with past:

<h1>Group last catch with past:</h1>Array
(
    [0] => stdClass Object
        (
            [id] => 490
            [name] => alliances
            [type] => sub
            [parent] => 9
        )

    [1] => stdClass Object
        (
            [id] => 704
            [name] => armed assault
            [type] => sub
            [parent] => 3
        )

    [2] => stdClass Object
        (
            [id] => 994
            [name] => australian politics
            [type] => sub
            [parent] => 9
        )

    [3] => stdClass Object
        (
            [id] => 116
            [name] => authors
            [type] => sub
            [parent] => 24
        )

    [4] => stdClass Object
        (
            [id] => 83
            [name] => corruption
            [type] => sub
            [parent] => 4
        )

    [5] => stdClass Object
        (
            [id] => 470
            [name] => democracy
            [type] => sub
            [parent] => 9
        )

    [6] => stdClass Object
        (
            [id] => 471
            [name] => dictatorship
            [type] => sub
            [parent] => 9
        )

    [7] => stdClass Object
        (
            [id] => 66
            [name] => domestic crime
            [type] => sub
            [parent] => 4
        )

    [8] => stdClass Object
        (
            [id] => 76
            [name] => drugs
            [type] => sub
            [parent] => 4
        )

    [9] => stdClass Object
        (
            [id] => 10
            [name] => education
            [type] => main
            [parent] => 
        )

    [10] => stdClass Object
        (
            [id] => 463
            [name] => elections
            [type] => sub
            [parent] => 9
        )

    [11] => stdClass Object
        (
            [id] => 123
            [name] => festivals
            [type] => sub
            [parent] => 24
        )

    [12] => stdClass Object
        (
            [id] => 278
            [name] => financial regulation
            [type] => sub
            [parent] => 7
        )

    [13] => stdClass Object
        (
            [id] => 469
            [name] => government
            [type] => sub
            [parent] => 9
        )

    [14] => stdClass Object
        (
            [id] => 62
            [name] => homicide
            [type] => sub
            [parent] => 4
        )

    [15] => stdClass Object
        (
            [id] => 1008
            [name] => human rights
            [type] => sub
            [parent] => 9
        )

    [16] => stdClass Object
        (
            [id] => 755
            [name] => humanitarian help
            [type] => sub
            [parent] => 1
        )

    [17] => stdClass Object
        (
            [id] => 489
            [name] => international treaties
            [type] => sub
            [parent] => 9
        )

    [18] => stdClass Object
        (
            [id] => 151
            [name] => investing
            [type] => sub
            [parent] => 8
        )

    [19] => stdClass Object
        (
            [id] => 435
            [name] => labour law
            [type] => sub
            [parent] => 6
        )

    [20] => stdClass Object
        (
            [id] => 105
            [name] => literature
            [type] => sub
            [parent] => 24
        )

    [21] => stdClass Object
        (
            [id] => 100
            [name] => movies
            [type] => sub
            [parent] => 24
        )

    [22] => stdClass Object
        (
            [id] => 220
            [name] => music awards
            [type] => sub
            [parent] => 25
        )

    [23] => stdClass Object
        (
            [id] => 134
            [name] => national holidays
            [type] => sub
            [parent] => 24
        )

    [24] => stdClass Object
        (
            [id] => 482
            [name] => political debates
            [type] => sub
            [parent] => 9
        )

    [25] => stdClass Object
        (
            [id] => 475
            [name] => political parties
            [type] => sub
            [parent] => 9
        )

    [26] => stdClass Object
        (
            [id] => 464
            [name] => political scandals
            [type] => sub
            [parent] => 9
        )

    [27] => stdClass Object
        (
            [id] => 241
            [name] => pollution
            [type] => sub
            [parent] => 21
        )

    [28] => stdClass Object
        (
            [id] => 479
            [name] => social movements
            [type] => sub
            [parent] => 9
        )

    [29] => stdClass Object
        (
            [id] => 990
            [name] => south american politics
            [type] => sub
            [parent] => 9
        )

    [30] => stdClass Object
        (
            [id] => 488
            [name] => supranational institutions
            [type] => sub
            [parent] => 9
        )

    [31] => stdClass Object
        (
            [id] => 208
            [name] => talent competitions
            [type] => sub
            [parent] => 25
        )

    [32] => stdClass Object
        (
            [id] => 142
            [name] => taxation
            [type] => sub
            [parent] => 8
        )

    [33] => stdClass Object
        (
            [id] => 3
            [name] => terrorism
            [type] => main
            [parent] => 
        )

    [34] => stdClass Object
        (
            [id] => 830
            [name] => tourism threats
            [type] => sub
            [parent] => 32
        )

    [35] => stdClass Object
        (
            [id] => 760
            [name] => war critique
            [type] => sub
            [parent] => 1
        )

)
<br><br><h1>Pairs to compare:</h1>0No pairs to compare found, exiting...<br>