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| 
                   | A type that is a model of Forward Range. | 
| 
                   | Object of type X. | 
        A range X where boost::range_iterator<X>::type is a model of Forward
        Traversal Iterator.
      
| Distance type | 
                   | A signed integral type used to represent the distance between two of the Range's iterators. This type must be the same as the iterator's distance type. | 
| Size type | 
                   | An unsigned integral type that can represent any nonnegative value of the Range's distance type. |