def FaceTri(R):
    """return the 5 faces of the triedre"""
    F1 = R[0][0], R[0][1], R[0][2]
    F2 = R[1][0], R[1][1], R[1][2]
    F3 = R[0][0], R[0][1], R[1][1], R[1][0]
    F4 = R[0][1], R[0][2], R[1][2], R[1][1]
    F5 = R[0][2], R[0][0], R[1][0], R[1][2]
    Faces = F1, F2, F3, F4, F5
    return Faces
