How to combat writer's block?

[ShadowHM]

If that still won't work and you can't get the introduction rolling... Skip it!  Work on the rest of the paper and come back to it later.  Using the rest of what you have written as a base the intro should just about write itself.
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I like jahcs advice.

And, just because the initial question reminded me of it:

I was working on the proof of one of my poems all the morning, and took out a comma. In the afternoon I put it back again.
Oscar Wilde