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columns.each do |c|
        case c
        when 'Device'
          h << c
        when 'Usage'
          h << c
        when 'Status'
          h << c
        when 'Battery'
          h << c
        when 'GPS status'
          h << c
        when 'Wi-Fi status'
          h << c
        when 'Temperature'
          h << c
        when 'Alerts'
          h << c
        end
      end
                                    
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