The operation 
is defined for all nonzero numbers by a b = \frac{a^2}{b} . Determine [(1 2) 3] - [1 (2 3)].
- A: - \frac{2}{3}
- B: - \frac{1}{4}
- C: 0
- D: \frac{1}{4}
- E: \frac{2}{3}
0
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