0.2|09 (5-1)/2 a^2=-1 a^2≥-1 1≥a^3≥-1
    0.2|09 (5-1)/2 a^2=-1 a^2≥-1 1≥a≥0
    0.2|09 (5-1)/2 a^2=-1 a^2≥-1
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