Circuit with three capacitors 2

The above diagram is a circuit that consists of three capacitors A, B and C with capacitances C0,C_0, 2C02C_0 and 2C0,2C_0, respectively. The voltage of the power supply is constant. Let E1E_1 be the electric energy charged on capacitor A when the switch S is open. Let E2E_2 be the electric energy charged on capacitor A when the switch S is closed. Then what is the ratio E1:E2?E_1:E_2?

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