def draw_tail_navigable(context):
    """
    Draw a normal arrow to indicate association end navigability at
    association tail.
    """
    cr = context.cairo
    cr.line_to(0, 0)
    cr.stroke()
    cr.move_to(15, -6)
    cr.line_to(0, 0)
    cr.line_to(15, 6)
