premise: The Rock ‘n’ Roll Mardi Gras Marathon is an annual international marathon race which takes place in New Orleans, Louisiana, in the United States. It is part of the Rock 'n' Roll Marathon Series of road running competitions and it also features the Rock ‘n’ Roll Mardi Gras Half Marathon.
hypothesis:  The Rock ‘n’ Roll Mardi Gras Marathon is a  marathon in the u.s with  half relay marathon
reason: it doesnt have a half relay marathon but a half  marathon