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I wonder what his plan is.

Can you tell me when this plan will begin?

The plan has already failed; he is probably sad.

This plan must be secure; there must be no errors whatsoever.

This plan doesn't seem to work, and it's utterly silly.

He deceived us so seamlessly that nobody suspected, but it turned out that the plan failed.

The plan we envisioned and the result are a completely different story.