def add_tors(tors1, tors2):
    """
    **Description:** adds tors2 to tors 1
    """
    out_tors = tors1
    for torsion_i in tors2:
        found = 0
        for torsion_j in out_tors:
            if torsion_i == torsion_j:
                found = 1
        if found == 0:
            out_tors.append(torsion_i)
    return out_tors
