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Correct procedure of initialization of BRepTopAdaptor_FClass2d and IntTools_FClass2d classifiers so as to produce more tight polygon in the case of self-intersections on very thin faces. The idea is concluded in checking the condition: defl < 2 * S / P, where S - is the surface area computed on produced polygon, P - its perimeter, defl - deflection computed on it. If the condition is not true the polygon is discretized again using QuasiUniformDeflection tool.