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-                      r5445
+                      r5499
 using System.Text;
+using System.Linq;
 using HeuristicLab.Core;
 using HeuristicLab.Common;
 using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
 namespace HeuristicLab.Encodings.SymbolicExpressionTreeEncoding.Formatters {
+namespace HeuristicLab.Encodings.SymbolicExpressionTreeEncoding {
   [Item("SymbolicExpressionTreeStringFormatter", "The default string formatter for symbolic expression trees.")]
 …
+    }
     private string FormatRecursively(SymbolicExpressionTreeNode node, int indentLength) {
+    private string FormatRecursively(ISymbolicExpressionTreeNode node, int indentLength) {
       StringBuilder strBuilder = new StringBuilder();
       if (Indent) strBuilder.Append(' ', indentLength);
       strBuilder.Append("(");
       // internal nodes or leaf nodes?
       if (node.SubTrees.Count > 0) {
+      if (node.SubTrees.Count() > 0) {
         // symbol on same line as '('
         strBuilder.AppendLine(node.ToString());
 …
       return new SymbolicExpressionTreeStringFormatter(this, cloner);
+    }
+  }
+}

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Changeset 5499 for branches/DataAnalysis Refactoring/HeuristicLab.Encodings.SymbolicExpressionTreeEncoding/3.4/Formatters