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SageManifolds: raising and lowering Lorentzian indices

In the reference manual of SageManifolds is shown how to calculate the curvature_form (pag. 407 of the reference).

However, the result is shown as $\Omega^a{}_b$, while I'd like to be able of manipulate the $\Omega^{ab}$.

Question: How can the latter be defined?

Thank you.