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In the circuit shown below, the capacitances are $C_1= 4.0 \mu F$, $C_2= 3.0 \mu F$, $C_3= 2.5 \mu F$, $C_4= 3.5 \mu F$, and the voltage of the battery is $V=9.0$ V.
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What is the equivalent (total) capacitance in micro Farads ($\mu F$) of the circuit? Do not enter any units in the answer box.