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10 cards from this deck
A−1A^{-1}A−1
Identity matrix III
Identity matrix
ad−bcad - bcad−bc
Determinant must be non-zero
Singular matrix (no inverse)
Swap diagonal, negate off-diagonal, divide by det
Not commutative: AB≠BAAB \neq BAAB=BA
On the right side
On the left side
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