Hi, the following codes output a wrong result.

```
{x,y}::Coordinate;
{a,b,c,d,e,f# }::Indices(vielbein, values={x,y}, position=independent);
{a,b,c,d,e,f# }::Integer(range=0..1)
\gamma_{a}::SelfAntiCommuting.
\omega^{a b}::AntiSymmetric.
ex:= xxx = \gamma_{a} \gamma_{b} \omega^{a b} ;
evaluate(ex,rhsonly=True,simplify=False);
```

I obtained

$\gamma_x \gamma_y \omega^{y x} +\gamma_y \gamma_x \omega^{x y}$

The right result should be

$\gamma_x \gamma_y \omega^{x y} +\gamma_y \gamma_x \omega^{y x}$

Any suggestion would be greatly appreciated!