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question about structure equality



i have a structure mdy (containing month day and year).
when i execute (equal (boa-mdy 1 1 1) (boa-mdy 1 1 1)) i get nil
but (equalp (boa-mdy 1 1 1) (boa-mdy 1 1 1)) returns t.
could someone explain this to me?
thanks,
dan stanger