A liquid mixture consists of 3.0 mol of compound A, with melting point of 144 K, and 2.0 mol of compound B, with melting point of 125 K. These substances form a compound AB, which melts congruently at 134 K. The system exhibits one eutectic at x(A) = 0.25 and 110 K and another at x(A) = 0.85 and 102 K. Describe the phase changes taking place when the liquid is cooled from 150 K to 70 K.

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