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must satisfy many material requirements due to biol-
ogy (Sachlos and Czernuszka, 2003) as well as have
the correct geometric shape, too.
ACKNOWLEDGEMENTS
The authors were supported by the Finnish Academy
grant Lastu 135005, European Union grant Sim-
ple4All, Aalto Starting Grant, and Åbo Akademi In-
stitute of Mathematics.
The current version of the software described in
this paper can be obtained from the authors by re-
quest.
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