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Mathematica > Structural Operations on Expressions >

FlattenAt

FlattenAt[list, n]
flattens out a sublist that appears as the n^th element of list. If n is negative, the position is counted from the end.

FlattenAt[expr, {i, j, ...}]
flattens out the part of expr at position {i, j, ...}.

FlattenAt[expr, {{i₁, j₁, ...}, {i₂, j₂, ...}, ...}]
flattens out parts of expr at several positions.

Flatten at position 2:

Flatten at positions 2 and 4:

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