Conversion from fenics to dolfinx

Hi, I was just wondering what is the best way to convert this tutorial on systems of coupled equations to DolfinX. I have done some tests using an approach similar to this tutorial, but they dont seem to work.
Thank you in advance.

Consider Tutorial on FEniCSx with Advection-diffusion-reaction in FEniCS.

The main thing that is not in the core of DOLFINx is checkpointing. For that you can use: GitHub - jorgensd/adios4dolfinx: Interface of ADIOS2 for DOLFINx
Everything else should be relatively straightforward to implement.

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