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Creating using literals

suggest change 
NSDictionary *inventory = @{
    @"Mercedes-Benz SLK250" : @(13),
    @"BMW M3 Coupe" : @(self.BMWM3CoupeInventory.count),
    @"Last Updated" : @"Jul 21, 2016",
    @"Next Update"  : self.nextInventoryUpdateString
};
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NSDictionary:
*NSDictionary
*Creating using literals
*Creating using dictionaryWithObjectsAndKeys
*Creating using plists
*Setting a Value in NSDictionary
*Getting a Value from NSDictionary
*Check if NSDictionary already has a key or not
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