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Range

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The two parameters to Range are the first number and the count of elements to produce (not the last number). 

// prints 1,2,3,4,5,6,7,8,9,10
Console.WriteLine(string.Join(",", Enumerable.Range(1, 10)));

// prints 10,11,12,13,14
Console.WriteLine(string.Join(",", Enumerable.Range(10, 5)));
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LINQ:
* LINQ
* SelectMany flat map
* Where filter
* Any
* GroupJoin
* ToLookup
* Except
* Zip
* Aggregate fold
* Concat
* Count
* Distinct
* Intersect
* SequenceEqual
* Min
* Cast
* All
* Sum
* Select map
* FirstOrDefault
* Take
* SingleOrDefault
* Reverse
* OfType
* Max
* Skip
* Average
* LastOrDefault
* Last
* GroupBy
* ToDictionary
* Union
* ToArray
* ToList
* Single
* ElementAt
* ElementAtOrDefault
* SkipWhile
* TakeWhile
* DefaultIfEmpty
* First find
* Contains
* Join
* OrderByDescending
* OrderBy
* Empty
* ThenBy
* Range
* Left Outer Join
* Repeat
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