For the function f(x) = 3(1|(3cos(3πx - 3) - 2) - 3| + 2)^2 + 4(1|(3cos(3πx - 3) - 2) - 3| + 2) + 3, find the number of maximal connected intervals in [-10, 10] where f'(x) < 0.

Present the answer in LaTex format: \boxed{Your answer}
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