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Iterators expose an enumerable set one element at a time. To develop the GetEnumerator of the IEnumerator interface, an iterator is required. The keywords "yield return" returns an element at a time when iterating through a set. For example the foreach command is implemented for an array with the following GetEnumerator method

for (i=0; i++; i < array.length){
yield return array[i]};
} }

The method returns an element with each call and a place holder for the next call in the for loop.