I'm making a plug for EV, I'm using mission computer and I'm wondering how do you make a mission avaidable only once and when you've completed it, it allows another mission to be found? Thanks.

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Do you want to know my signature?
really?
well...
Tough!:p

You use mission bits. You set the first mission to not be available when bit X is set, and upon completion, you set bit X. The second mission is only available when bit X is set, so when the first mission sets X, then it becomes available. You also set the mission to not be available when X+1 is set, and upon completion, set X+1, etc...

Matrix

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"Nothing is fool-proof to a sufficiently talented fool."