One kilogram of air at a pressure of P = 10^6 Pa and a temperature of T = 500 K expands isothermally so that the pressure decreases by a factor of four. After that, the gas is compressed adiabatically to its original pressure, and then isobarically returned to its original state. Draw a graph of the process in P–V coordinates. Determine the work done by the gas per cycle.

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