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The distribution of the chi-square scores of "KR" over different tested families on SCOP 1.53 superfamily benchmark (a) and the distribution of the chi-square scores of "LI" over different tested superfamilies on SCOP 1.53 fold benchmark (b). "KR" is the Top-2-gram with the highest average chi-square score (32.0716) on SCOP 1.53 superfamily benchmark and "LI" is the Top-2-gram with the highest average chi-square score (81.3576) on SCOP 1.53 fold benchmark.
