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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