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The FlattenOnce(L) function converts any element in list L which are of type list to expression sequences.

Note: The procedure ListTools[FlattenOnce](L) is more efficient than a call to ListTools[Flatten](L, 1).

$\mathrm{with}\left(\mathrm{ListTools}\right)\:$

$L≔\left[1\,2\,3\,\left[4\,5\,6\right]\right]$

$L≔\left[1\,2\,3\,\left[4\,5\,6\right]\right]$

$\mathrm{FlattenOnce}\left(L\right)$

$\left[1\,2\,3\,4\,5\,6\right]$

$L≔\left[1\,\left[2\right]\,\left[3\,\left[4\right]\right]\,\left[\left[\left[5\right]\right]\,6\right]\right]$

$L≔\left[1\,\left[2\right]\,\left[3\,\left[4\right]\right]\,\left[\left[\left[5\right]\right]\,6\right]\right]$

$\mathrm{FlattenOnce}\left(L\right)$

$\left[1\,2\,3\,\left[4\right]\,\left[\left[5\right]\right]\,6\right]$

$\mathrm{Flatten}\left(L\right)$

$\left[1\,2\,3\,4\,5\,6\right]$