Look at this series: 2, 1, (1/2), (1/4), ... What number should come next?

Look at this series: 7, 10, 8, 11, 9, 12, ... What number should come next?

Look at this series: 36, 34, 30, 28, 24, ... What number should come next?

Look at this series: 22, 21, 23, 22, 24, 23, ... What number should come next?

Look at this series: 53, 53, 40, 40, 27, 27, ... What number should come next?

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