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The odds aren't zero.
Given the situation, I want to be cautious.
It doesn't seem that simple, either.
That kind of story is hard to believe.
They've probably arrived by now.
Well, that's about the size of it.
It's not good to speak on assumptions.
The outcome is anyone's guess.
That would be the reasonable assumption.
Bold, to put it kindly; reckless, to put it bluntly.
I think the chances are slim.
It's too soon to assume that.