Contact mechanics model
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In `compression.py` it is shown how to couple the Solid Mechanics Model with the Contact Mechanics Model. The example
simulate the contact betweem two blocks.
.. figure:: examples/python/contact_mechanics_model/images/compression.svg
:align: center
:width: 25%
.. figure:: examples/python/contact_mechanics_model/images/contact.gif
:align: center
:width: 50%