orignla array:
Array ( [1] => data-analysis-essays [2] => research-questions-essays [3] => personal-information-essays [4] => financial-risk-essays [5] => customer-satisfaction-essays [6] => united-states-essays [7] => customer-loyalty-essays [8] => online-business-essays [9] => business-environment-essays [10] => american-airlines-essays [11] => airline-industry-essays [12] => research-design-essays [13] => consumer-perception-essays [14] => target-market-essays [15] => focus-groups-essays [16] => quantitative-research-essays [17] => information-technology-essays [18] => online-essays [19] => travel-essays [20] => quality-essays [21] => internet-essays [22] => companies-essays [23] => book-essays [24] => employees-essays [25] => reliability-essays [26] => china-essays [27] => process-essays [28] => marketing-essays [29] => personal-essays [30] => weather-essays [31] => framework-essays [32] => family-essays [33] => people-essays [34] => management-essays [35] => security-essays [36] => perception-essays [37] => description-essays [38] => journal-essays [39] => taxation-essays [40] => children-essays [41] => issues-essays [42] => entrepreneurship-essays [43] => history-essays [44] => europe-essays [45] => place-essays [46] => imagination-essays [47] => life-essays [48] => youth-essays [49] => amazon-essays [50] => behavior-essays [51] => london-essays [52] => australia-essays [53] => theory-essays [54] => space-essays [55] => wind-essays [56] => test-essays [57] => database-essays [58] => respect-essays [59] => privacy-essays [60] => branding-essays [61] => advertising-essays [62] => stability-essays [63] => microsoft-essays )
remove array:Array ( [1] => data-analysis-essays [2] => research-questions-essays [3] => personal-information-essays [4] => financial-risk-essays [5] => customer-satisfaction-essays [6] => united-states-essays [7] => customer-loyalty-essays [8] => online-business-essays [9] => business-environment-essays [10] => american-airlines-essays [11] => airline-industry-essays [12] => research-design-essays [13] => consumer-perception-essays [14] => target-market-essays [15] => focus-groups-essays [16] => quantitative-research-essays [17] => information-technology-essays [19] => travel-essays [21] => internet-essays [24] => employees-essays [25] => reliability-essays [26] => china-essays [28] => marketing-essays [29] => personal-essays [30] => weather-essays [31] => framework-essays [32] => family-essays [34] => management-essays [35] => security-essays [36] => perception-essays [37] => description-essays [38] => journal-essays [39] => taxation-essays [40] => children-essays [42] => entrepreneurship-essays [43] => history-essays [44] => europe-essays [45] => place-essays [46] => imagination-essays [48] => youth-essays [49] => amazon-essays [50] => behavior-essays [51] => london-essays [52] => australia-essays [53] => theory-essays [54] => space-essays [55] => wind-essays [57] => database-essays [58] => respect-essays [59] => privacy-essays [60] => branding-essays [61] => advertising-essays [62] => stability-essays [63] => microsoft-essays )