Federal Express is now called FedEx

Federal Express is now called FedEx.
When I retire I’ll be a FedEx ex.
But if I’m an officer when I retire, I’ll be an ex Fedex Exec.
Then after a divorce, my ex-wife will be an ex FedEx exec’s ex.
If I rejoin FedEx in time, I’d be an ex ex FedEx exec.
When we remarry, my wife will be an ex ex FedEx exec’s ex.