<pre>Array
(
    [13] => I
    [1] => J
    [2] => K
    [3] => L
    [4] => M
    [5] => N
    [6] => O
    [7] => P
    [8] => R
    [10] => S
    [9] => S
    [14] => SS
    [11] => T
    [12] => U
    [0] => Y
)
</pre>