def get_cell_borders(corners:list) -> list:
    """
    Computes the start- and end-points of the four lines delimiting a cell.
    
    :param cell_corners: List of 4 tuples (corner-coordinates in Y,X)
    :returns: List of 4 lists (= 4 cell-borders) containg 2 tuples (= start- and end-points in [Y, X])

    :Example:

    """

    cell_borders = [
        [corners[0], corners[1]],
        [corners[1], corners[2]],
        [corners[2], corners[3]],
        [corners[3], corners[0]],
        ]

    return cell_borders