BBTK_INPUT(ConcatStrings,In9, "String 9", std::string,"");
BBTK_INPUT(ConcatStrings,In10,"String 10",std::string,"");
BBTK_OUTPUT(ConcatStrings,Out,"Concatenated string",std::string,"");
BBTK_INPUT(ConcatStrings,In9, "String 9", std::string,"");
BBTK_INPUT(ConcatStrings,In10,"String 10",std::string,"");
BBTK_OUTPUT(ConcatStrings,Out,"Concatenated string",std::string,"");