def check_tri_faces(sheet, manager, **kwargs):
    """Three neighbourghs cell elimination
    Add all cells with three neighbourghs in the manager
    to be eliminated at the next time step.
    Parameters
    ----------
    sheet : a :class:`tyssue.sheet` object
    manager : a :class:`tyssue.events.EventManager` object
    """
    check_tri_faces_spec = default_check_tri_face_spec
    check_tri_faces_spec.update(**kwargs)

    tri_faces = sheet.face_df[(sheet.face_df["num_sides"] < 4)].id
    manager.extend(
        [
            (face_elimination, {"face_id": f, "geom": check_tri_faces_spec["geom"]})
            for f in tri_faces
        ]
    )