To avoid the nonuniqueness,
- Give unique global numbers to all nodes.
When generating local mesh by Delaunay tesselation,
nodes are added in the order of the numbers.
- While Delaunay tesselation,
in case that a new-added node is on the circumcircle of a element,
new two elements should be regenerated after deleting the old one.
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nonuniqueness of local element generation
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