Array
(
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    [2] => 
    [3] => 
    [4] => 
    [5] => 
    [6] => 
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    [8] => 
    [9] => 
    [10] => 
    [11] => 
    [12] => 
    [13] => 
    [14] => 
    [15] => 
)
Array
(
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    [11] => 11
    [12] => 12
    [13] => 13
    [14] => 14
    [15] => 15
)