[p2A2T-1]
[pA1/2T-1]
[p1/2AT-1]
[p0A-2T-2]
→ x = 1
→ x + 2y = 2
1 + 2y = 2
y = 1/2
→ − x + z = − 2
−1 + z = − 2
z = – 1
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