def constraint_all(x):
    test = [constraint_cost(x) >= 0,
            constraint_unique(x) == 0,
            constraint_gk(x) == 0,
            constraint_def_3(x) >= 0,
            constraint_def_5(x) >= 0,
            constraint_mid_3(x) >= 0,
            constraint_mid_5(x) >= 0,
            constraint_str_1(x) >= 0,
            constraint_str_3(x) >= 0]
    return(all(test))
# if constraint_all(x) is True, all tests are passed