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__Constants__	typical %...%-constants that can be used in the input files
__DEFAULT_configuration_file__	allows to provide Ucv_DEFAULT.dat as a generalistic/default definition
__DeprecatedItems__	Deprecated items to be removed in the future
__GeneralRemarks__	general remarks upon the syntax within UCV files
__Indices__	MESHFREE indices for simulation entities
__Parameters__	CV-parameters that can also be set in UCV
__overview_of_syntax_elements__	shows all possible syntax in USER_common_variables