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Old January 13th, 2013, 08:49 AM   #2 (permalink)
Clementine_3
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Location: Down in the park where the Machmen meet the machines and play 'kill by numbers'
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Forever.
If you don't upgrade when you are 'due' you can just hold on to it 'til you are ready. I have two lines that are upgradeable and have been for a long while now. The upgrades don't expire.
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