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ATQ, The series follows the pattern: 18 + 4 = 22, 22 + 6 = 28, 28 + 10 = 38, 38 + 16 = 54, 54 + 24 = 78. 4 + 2 = 6, 6 + 4 = 10, 10 + 6 = 16, 16 + 8 = 24,