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Extract

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Extract[expr, list]

extracts parts of expr specified by list.

Extract[expr, {$list_1$, $list_2$, ...}]

extracts a list of parts.

Extract[expr, i, j, ...] is equivalent to Part[expr, {i, j, ...}].

• • Extract[a + b + c, {2}]

• • Extract[{{a, b}, {c, d}}, {{1}, {2, 2}}]