How do I make oxygen for a generation ship?

On a generation ship, the people living on it need oxygen, lots of oxygen. More than they can realistically carry, thus a generation ship must be able to create breathable air from relatively common materials and elements found in space.

How does a generation ship provide oxygen to the people inside it? What common elements can the ship rely on to provide, let's say, 100 million people with breathable air for an indefinite amount of time?

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How do I make oxygen for a generation ship?

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