3 cycles / 12 seconds = 0.25 cycles / second, or 0.25 Hz.
3 cycles / 12 seconds = 0.25 cycles / second, or 0.25 Hz.
3 cycles / 12 seconds = 0.25 cycles / second, or 0.25 Hz.
3 cycles / 12 seconds = 0.25 cycles / second, or 0.25 Hz.
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