But as I explained here, points are meaningless unless you can redeem them for a seat to a particular destination, on the date of your choice and in the desired class of service.

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This means that you are selling someone else the right to buy it at a stated strike price on or before a future date.

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"You can have a master copy of PC Cillin that makes sure all your copies are up to date just by clicking on one, " says Mr Craig from Trend Micro.

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