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Fibonacci sequence

The next element of the Fibonacci sequence is obtained by taking the sum of the previous two elements of the sequence. If the sequence starts with the values 1 and 2, then the first 10 elements of the sequence are as follows:

1, 2, 3, 5, 8, 13, 21, 34, 55, 89, …

What is the sum of the even elements of the sequence that are less than 3 million?

Nim

Try to generate the elements of the Fibonacci sequence with an iterator.