If a, b, c are three non-coplanar vectors, such that \(\left[ {\vec b \times \overrightarrow {c,} \vec c \times \overrightarrow {a,} \vec a \times \vec b} \right] = 2\left[ {\vec a,\vec b,\vec c} \right],\)then the value of \([\vec{a}, \vec{b}, \vec{c}]\)is equal to
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