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freedom per node set with the DACreateXX() routine. Thus the x, y, z, and
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m, n, p can be thought of as coordinates on a logical grid, where each
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grid point has (potentially) several degrees of freedom.
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Any of y, z, n, and p can be passed in as PETSC_NULL if not needed.
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Any of y, z, n, and p can be passed in as <A HREF="../Sys/PETSC_NULL.html#PETSC_NULL">PETSC_NULL</A> if not needed.