How would you play this upcoming casino drawing?

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This is an example of a prisoner's dilemma. I think the standard advice is to vote STEAL because you give yourself a chance at 20k if your opponent votes SPLIT.

If your opponent votes STEAL, your win is 5k no matter how you voted.

If you could reliably collude with the other player, then you could work out a deal to guarantee 25k total. But unless the other player is your spouse, I don't know how that could be accomplished.

Am I missing anything?