Look at this series: 3, 4, 7, 8, 11, 12, ... What number should come next?

Look at this series: 31, 29, 24, 22, 17, ... What number should come next?

Look at this series: 8, 22, 8, 28, 8, ... What number should come next?

2 3 4 5 6 4 8

8 11 21 15 18 21 22

75 65 85 55 45 85 35

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