blah.cs

			var x = 
				from blah in Enumerable.Range(0, 10000).AsSequential()
				where blah % 2 == 1
				select blah;
			//By default the result of this custom list comprehension is an object called DelayedSequential<T>. 
			//This object is evaluated and a concrete collection is returned via an implicit conversion.

			Sequential<int> s = x;

			//Alternatively, we can write

			Sequential<int> y =
				from blah in Enumerable.Range(0, 1000).AsSequential()
				select blah;
			//In which case the conversion occurs right after the query is completed.

			//More complex stuff:

			var z =
				from blah in Enumerable.Range(0, 100).AsSequential()
				from blah2 in Enumerable.Range(0, blah)
				select blah2;