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[plt-scheme] need examples on some macro patterns

From: ying hu (hu.ying.13 at gmail.com)
Date: Wed Apr 1 10:00:11 EDT 2009		 
Hi,

When I was reading 11.1 of plt scheme reference, I can't understand the
patterns below
  | #(pattern ...)  | #(pattern ... pattern ellipses pattern ...)  | #s(
key-datum pattern ...)  | #s(key-datum pattern ... pattern ellipses pattern
...)
I tried to find some examples about these on google but I failed.
Can someone give me some example on these patterns?


Thanks a lot
Huying
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