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a Christmas carol
maybe because a chirstmas carol has to do with christmas .
The original title of "A Christmas Carol" was "A Christmas Carol in Prose, Being a Ghost Story of Christmas," when it was first published in 1843.
The correct word in this case would be Christmas carol.
Kevin12Mario Movies - 2013 Mario Bros Christmas Carol 1-1 was released on:
USA: 25 December 2013