One gram molecule of an ideal gas is located in a cylinder under the piston at temperature T1. The gas is heated at constant pressure to temperature T2, then at constant volume it is heated to temperature T3. Next, the gas is cooled at constant pressure so that its volume drops to its original value. Finally, at a constant volume, the gas returns to its original state. Thus, a closed process (cycle) is completed over the gas. How much work was done by the gas in this process?

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