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How to make an upgrade to be researched only once

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I want my upgrade to be researchable only once, like the normal attack and armour upgrades. After its researched a new better upgrade will appear, unless there is no better upgrade, in which case the upgrade button will disappear, just like the normal attack and armour upgrades.
Right now, i have only one upgrade and i want it to disappear once its completed, but i can research it a million times.
 
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