But the point holds: There are only a few more chances for Trump to get to 1,237. A big one is next week in Indiana, but there's little question that the effort will come down to June 7, and the delegate behemoth that is California.

The driving question is whether or not Trump will close the deal, meaning get to the 1,237 delegates he needs to formally be the GOP standard-bearer. The lingering answer is that it's hard to say. He's much better positioned now than he was several weeks ago, before his unexpectedly strong performances in the Northeast. But he'll need every last contest to get there.

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It's hard to predict in part because the remaining states all have generally different processes for doling out delegates. Indiana is a winner-take-most state, meaning that someone who does well there can be expected to take most of the delegates. New Jersey and Nebraska are winner-take-all. Oregon and Washington are proportional -- like the Democratic contests -- meaning that you get more delegates the better you do. And then there's the question of Trump's unbound delegates, people who say they'll support him at the convention but who don't have to. Do you count them as stable, or no?

We're not going to answer those questions. Instead, we're going to let you answer them. Imagine if the 1,237 delegates Trump needs were bricks, building a tower. A Trump tower of delegates. Play with the tool below and see what combination of wins -- and by what margins -- might give him the victory he seeks. Notice how different results in Indiana and California shift the calculus, too.