Ok, in computer science, we have to know about converting from postfix
to prefix, etc, but there's no manual around which explains this to me.
Only a few examples.  Anyhow, can someone show me the answeres to the
following?
Convert these postfix to infix:
ABCD-/+
AB-C/D+
AX+Y+UV-/
AX+Y+U/V-
Convert these infix to postfix:
A*(S+Y/W)/(U-V) 
A-B-C+W 
A*(B-Y-X-E)/(F+G)
A-B/C-D*E/F/G
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