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a. The most severe episode lasted approximately twenty hours, the pain centering around my navel.

b. The most severe episode lasted approximately twenty hours, the pain centered around my navel.

c. The most severe episode lasted approximately twenty hours, the pain of which centered around my navel.

d. The most severe episode lasted approximately twenty hours, the pain of which was centered around my navel.

e. The most severe episode lasted approximately twenty hours, whose pain was centered around my navel.

f. The most severe episode lasted approximately twenty hours, whose pain centered around my navel.

Thank you. Emotion: smile
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Comments  (Page 2) 
AvangiI just wrote a very long post, but I scrapped it.

I do the same thing. As you write it, you're happy with what you're saying, but then once you've spent the good part of an hour writing it, you realise what you've said just makes you want to throw up Emotion: ick!