orignla array:
Array
(
    [1] => john-steinbeck-essays
    [2] => ernest-hemingway-essays
    [3] => short-story-essays
    [4] => nature-essays
    [5] => life-essays
    [6] => earth-essays
    [7] => women-essays
    [8] => fertility-essays
    [9] => power-essays
    [10] => character-essays
    [11] => abortion-essays
    [12] => american-essays
    [13] => process-essays
    [14] => literature-essays
    [15] => hair-essays
    [16] => academic-essays
    [17] => connection-essays
    [18] => conflict-essays
    [19] => pregnancy-essays
    [20] => bank-essays
    [21] => plants-essays
    [22] => conclusion-essays
    [23] => allegory-essays
    [24] => sexuality-essays
    [25] => analysis-essays
    [26] => respect-essays
    [27] => personification-essays
    [28] => theme-essays
    [29] => land-essays
    [30] => protagonist-essays
    [31] => reflection-essays
)

remove array:
Array
(
    [1] => john-steinbeck-essays
    [2] => ernest-hemingway-essays
    [3] => short-story-essays
    [4] => nature-essays
    [6] => earth-essays
    [7] => women-essays
    [8] => fertility-essays
    [9] => power-essays
    [10] => character-essays
    [11] => abortion-essays
    [14] => literature-essays
    [15] => hair-essays
    [16] => academic-essays
    [17] => connection-essays
    [18] => conflict-essays
    [19] => pregnancy-essays
    [20] => bank-essays
    [21] => plants-essays
    [22] => conclusion-essays
    [23] => allegory-essays
    [24] => sexuality-essays
    [25] => analysis-essays
    [26] => respect-essays
    [27] => personification-essays
    [28] => theme-essays
    [29] => land-essays
    [30] => protagonist-essays
    [31] => reflection-essays
)