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A 2 3a 1 0
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A 2 3a 1 0
a 2 u221A 3a 1 0
a 2 3a 1 0 then a3 1 a 3
a 2 3a 1 0 find a2 1 a 2
a 2 3a 1 0 find a 1 a
a 2 3a 1 0