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In particular the analyses illustrate the difficulty with giving a quantitative and consistent definition for each of the six SSE types especially for 3 -helix, β-bulge, turn or loop in terms of either backbone H-bond patterns, or backbone dihedral angles, or C -polyline or pc-polyline. The difficulty suggests that the SSE space though being dominated by the regions for the six SSE types is to a certain degree continuous. The program is available at https//github.com/wlincong/p2pSSE. The program is available at https//github.com/wlincong/