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Play With Set (new Python 2.4 Module)
a = set("ABC")
b = set("CDE")
print "A:",a
print "B:",b
print "Intersection:\t",a & b
print "Union:\t\t",a | b
print "Diff a-b:\t\t",a - b
print "Diff b-a:\t\t",b - a
print "Exclusive:\t\t",a ^ b
