def flux_r(q_vars: List[fl.Var], i: int, j: int):
    """Make Fluxion with the distance between body i and j"""
    return fl.sqrt(flux_r2(q_vars, i, j))
def flux_r ( q_vars : List [ fl . Var ] , i : int , j : int ) : return fl . sqrt ( flux_r2 ( q_vars , i , j ) )
Make Fluxion with the distance between body i and j