Master key = Square black plastic head.
Valet key = Oval black plastic head ( some with red dot.)
Spare key = Half moon steel, with no black plastic head.



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[http://languageandgrammar.com/2008/01/14/youve-got-problems-not-issues/ ]

"A liberal is someone who feels they owe a great debt to their fellow man, which debt he proposes to pay off with your money."