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@@ -18,8 +18,8 @@ To connect mlpack and SICStus prolog i used the c interface of SICStus which can
 
 ## Extra Symbols
 
-* is the symbol for inupting a concret value from prolog to c/c++
-* is the symbol for inputing a variable from prolog to c/c++ that then gets assigned a value in one c side, that then can be used on the prolog side.
+* + is the symbol for inupting a concret value from prolog to c/c++
+* - is the symbol for inputing a variable from prolog to c/c++ that then gets assigned a value in one c side, that then can be used on the prolog side.
 * \[-\]
 
   is the symbol for an output value from c/c++ to prolog, in its function very similar to -.