docs: def index_2d(seqs: List[List[Any]], target: Any) -> Tuple[int, int]:
      """Finds the first index of a target item within a list of lists.
  
      Args:
          seqs: The list of lists to search.
          target: The item to find.
  
      Raises:
          ValueError: Item is not present.
      """
      for i in range(len(seqs)):
          for j in range(len(seqs[i])):
              if seqs[i][j] == target:
                  return i, j
      raise ValueError('Item not present.')