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  • 1 University of Szeged Bolyai Institute Aradi vértanúk tere 1 6720 Szeged Hungary
  • 2 Eötvös Loránd University Department of Algebra and Number Theory H-1117 Budapest Pázmány Péter sétány 1/c Hungary
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The aim of the present paper is to carry on the research of Czédli in determining the maximum number of rectangular islands on a rectangular grid. We estimate the maximum of the number of triangular islands on a triangular grid.