Question: RemoveHoliday from Calendar

If I change a sample calendar the base calendar is also changed. 

with(Finance):

c:=Calendar(Toronto):

IsHoliday("November 11, 2013",c)
                                                   true

IsHoliday("November 11, 2013",Toronto)
                                                          true

RemoveHoliday("November 11, 2013",c) #Remove the holiday from the created Calendar c

IsHoliday("November 11, 2013",c)
                                                  false

IsHoliday("November 11, 2013",Toronto)
                                                           false

I didn't think the holiday would also be removed from Toronto, I just wanted it removed from the created c calendar. 

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