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/usr/share/hyphy/SubstitutionClasses/nuc.bf is in hyphy-common 2.2.7+dfsg-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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TemplateNames = {{
	"Transitions",
	"Transversions"
}};

SubClassNames = {{
	"Purines",
	"Pyrimidines"
}};

function CreateTemplates (classID)
{
	if (classID==0)
	{	
		MatrixTemplate = {{2,7,8,13}};
	}
	else
	{
		if (classID==1)
		{
			MatrixTemplate = {{1,3,4,6,9,11,12,14}};
		}
	}
	return 0;
}

function CreateSubClasses (classID)
{
	if (classID==0)
	{
		MatrixTemplate = {{0,2}};
	}
	else
	{
		if (classID==1)
		{
			MatrixTemplate = {{1,3}};
		}
	}
	return 0;
}