def merge$\_$list$($list$1,$ list$2,$ index$)$:

$"""$merge two lists into one list, based on the index received from list$1$ as an argument.

Args:

list$1($list$)$: A list of items.

list$2($int$)$: A $2$nd list of elements

Index $($list$)$: The index to merge the list into.

Returns:

tuple: A tuple of two elements containing both sublists.

$"""$