orignla array:
Array
(
    [1] => financial-system-essays
    [2] => white-house-essays
    [3] => republican-party-essays
    [4] => income-tax-essays
    [5] => great-depression-essays
    [6] => unemployment-rate-essays
    [7] => race-essays
    [8] => obama-essays
    [9] => economy-essays
    [10] => business-essays
    [11] => connections-essays
    [12] => reaction-essays
    [13] => position-essays
    [14] => people-essays
    [15] => destiny-essays
    [16] => bank-essays
    [17] => population-essays
    [18] => tenure-essays
    [19] => authority-essays
)

remove array:
Array
(
    [1] => financial-system-essays
    [2] => white-house-essays
    [3] => republican-party-essays
    [4] => income-tax-essays
    [5] => great-depression-essays
    [6] => unemployment-rate-essays
    [7] => race-essays
    [8] => obama-essays
    [9] => economy-essays
    [10] => business-essays
    [11] => connections-essays
    [12] => reaction-essays
    [13] => position-essays
    [15] => destiny-essays
    [16] => bank-essays
    [17] => population-essays
    [18] => tenure-essays
    [19] => authority-essays
)