Department of Mathematics and Computer Science, University of Udine, 33100 Udine, Italy. rvicedomini@appliedgenomics.org|Department of Mathematics and Computer Science, University of Udine, 33100 Udine, Italy. rvicedomini@appliedgenomics.org|Department of Mathematics and Computer Science, University of Udine, 33100 Udine, Italy. rvicedomini@appliedgenomics.org|Department of Mathematics and Computer Science, University of Udine, 33100 Udine, Italy. rvicedomini@appliedgenomics.org|Department of Mathematics and Computer Science, University of Udine, 33100 Udine, Italy. rvicedomini@appliedgenomics.org