BBTK_INPUT(ConcatStrings,In1, "String 1", std::string,"");
BBTK_INPUT(ConcatStrings,In2, "String 2", std::string,"");
BBTK_INPUT(ConcatStrings,In3, "String 3", std::string,"");
BBTK_INPUT(ConcatStrings,In1, "String 1", std::string,"");
BBTK_INPUT(ConcatStrings,In2, "String 2", std::string,"");
BBTK_INPUT(ConcatStrings,In3, "String 3", std::string,"");