diff --git a/src/main/java/de/tlc4b/analysis/Renamer.java b/src/main/java/de/tlc4b/analysis/Renamer.java
index 907739f9ce192973a7b0a26cc49769da05f31c35..d98a9ffe40983a34cb856a37234bb8579d71315a 100644
--- a/src/main/java/de/tlc4b/analysis/Renamer.java
+++ b/src/main/java/de/tlc4b/analysis/Renamer.java
@@ -147,13 +147,11 @@ public class Renamer extends DepthFirstAdapter {
 		for (PDefinition e : copy) {
 			String name = null;
 			if (e instanceof AExpressionDefinitionDefinition) {
-				name = ((AExpressionDefinitionDefinition) e).getName()
-						.getText();
+				name = ((AExpressionDefinitionDefinition) e).getName().getText();
 			} else if (e instanceof APredicateDefinitionDefinition) {
 				name = ((APredicateDefinitionDefinition) e).getName().getText();
 			} else if (e instanceof ASubstitutionDefinitionDefinition) {
-				name = ((ASubstitutionDefinitionDefinition) e).getName()
-						.getText();
+				name = ((ASubstitutionDefinitionDefinition) e).getName().getText();
 			}
 			String newName = incName(name);
 			namesTable.put(e, newName);
diff --git a/src/main/java/de/tlc4b/prettyprint/TLAPrinter.java b/src/main/java/de/tlc4b/prettyprint/TLAPrinter.java
index 7c6f9510cece6e8bb051d46fa3600dbc4a4914ce..b43f7a120d8d5a01f9d2dda0b1119daab672ecc5 100644
--- a/src/main/java/de/tlc4b/prettyprint/TLAPrinter.java
+++ b/src/main/java/de/tlc4b/prettyprint/TLAPrinter.java
@@ -247,16 +247,14 @@ public class TLAPrinter extends DepthFirstAdapter {
 			}
 		}
 		// CONSTANTS
-		ArrayList<ConfigFileAssignment> assignments = configFile
-				.getAssignments();
+		List<ConfigFileAssignment> assignments = configFile.getAssignments();
 		if (!assignments.isEmpty()) {
 			configFileString.append("CONSTANTS\n");
 			for (ConfigFileAssignment assignment : assignments) {
 				configFileString.append(assignment.getString(renamer));
 			}
 		}
-		if (TLC4BGlobals.useSymmetry()
-				&& !machineContext.getDeferredSets().isEmpty()) {
+		if (TLC4BGlobals.useSymmetry() && !machineContext.getDeferredSets().isEmpty()) {
 			configFileString.append("SYMMETRY Symmetry\n");
 		}
 
diff --git a/src/main/java/de/tlc4b/tla/ConfigFile.java b/src/main/java/de/tlc4b/tla/ConfigFile.java
index 456c37d07d71ba7beaf39a93fbf91598e53b2fb4..9ae6778c49709e39312cd5a1e0b5ef6517763d67 100644
--- a/src/main/java/de/tlc4b/tla/ConfigFile.java
+++ b/src/main/java/de/tlc4b/tla/ConfigFile.java
@@ -1,46 +1,41 @@
 package de.tlc4b.tla;
 
 import java.util.ArrayList;
+import java.util.List;
 
 import de.tlc4b.tla.config.ConfigFileAssignment;
 
-
 public class ConfigFile {
 
-	private final ArrayList<ConfigFileAssignment> assignments;
+	private final List<ConfigFileAssignment> assignments;
 	private int invariantNumber;
 	private boolean spec;
 	private boolean init;
 	private boolean next;
 	private int assertionsSize;
 	private boolean goal;
-	
-	
-	public ConfigFile(){
+
+	public ConfigFile() {
 		this.assignments = new ArrayList<>();
 		this.invariantNumber = 0;
 	}
 
-
-	public ArrayList<ConfigFileAssignment> getAssignments() {
+	public List<ConfigFileAssignment> getAssignments() {
 		return assignments;
 	}
 
 	public boolean isSpec(){
 		return spec;
 	}
-	
 
 	public void setInvariantNumber(int number) {
 		this.invariantNumber = number;
 	}
 
-
 	public boolean isInit() {
 		return init;
 	}
 
-
 	public boolean isNext() {
 		return next;
 	}
@@ -49,22 +44,18 @@ public class ConfigFile {
 		assignments.add(assignment);
 	}
 
-
 	public int getInvariantNumber() {
 		return this.invariantNumber;
 	}
 
-
 	public void setInit() {
 		this.init = true;
 	}
 
-
 	public void setNext() {
 		this.next = true;
 	}
 
-
 	public void setAssertionSize(int size) {
 		assertionsSize = size;
 	}
diff --git a/src/main/java/de/tlc4b/tla/config/ConfigFileAssignment.java b/src/main/java/de/tlc4b/tla/config/ConfigFileAssignment.java
index 64b0fafa49eb5626bcfb1d2fdbcd9cc87ef01421..e74f20da48dab142b531808c02ecbca16bc6bfc2 100644
--- a/src/main/java/de/tlc4b/tla/config/ConfigFileAssignment.java
+++ b/src/main/java/de/tlc4b/tla/config/ConfigFileAssignment.java
@@ -2,6 +2,7 @@ package de.tlc4b.tla.config;
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.stream.Collectors;
 
 import de.be4.classicalb.core.parser.node.AIdentifierExpression;
 import de.be4.classicalb.core.parser.node.TIdentifierLiteral;
@@ -12,14 +13,9 @@ public abstract class ConfigFileAssignment {
 	public abstract String getString(Renamer renamer);
 	
 	public String getIdentifier(AIdentifierExpression node) {
-		StringBuilder res = new StringBuilder();
-		
-		List<TIdentifierLiteral> copy = new ArrayList<>(
-				node.getIdentifier());
-		for (TIdentifierLiteral e : copy) {
-			res.append(e.getText());
-		}
-		return res.toString();
+		return node.getIdentifier().stream()
+				.map(TIdentifierLiteral::getText)
+				.collect(Collectors.joining());
 	}
 	
 }
diff --git a/src/main/java/de/tlc4b/tla/config/ModelValueAssignment.java b/src/main/java/de/tlc4b/tla/config/ModelValueAssignment.java
index a92f63620687d0e86a29aecc633c2c7d86087674..d341ca8ccb0f334d0fdd1f3effb6201f27b093c3 100644
--- a/src/main/java/de/tlc4b/tla/config/ModelValueAssignment.java
+++ b/src/main/java/de/tlc4b/tla/config/ModelValueAssignment.java
@@ -13,9 +13,7 @@ public class ModelValueAssignment extends ConfigFileAssignment{
 
 	public String getString(Renamer renamer) {
 		AIdentifierExpression id = (AIdentifierExpression) node;
-		getIdentifier(id);
 		String conString = renamer.getNameOfRef(id);
-		return conString+ " = "+ conString +"\n";
+		return conString + " = " + conString + "\n";
 	}
-	
 }
diff --git a/src/main/java/de/tlc4b/tla/config/SetOfModelValuesAssignment.java b/src/main/java/de/tlc4b/tla/config/SetOfModelValuesAssignment.java
index 5d0607d6c77f1456d68f6c4dc31b68150a4657f2..b05655464bb39c8efbee976e0f0c97ce319a9206 100644
--- a/src/main/java/de/tlc4b/tla/config/SetOfModelValuesAssignment.java
+++ b/src/main/java/de/tlc4b/tla/config/SetOfModelValuesAssignment.java
@@ -1,62 +1,39 @@
 package de.tlc4b.tla.config;
 
-import java.util.List;
-
 import de.be4.classicalb.core.parser.node.ADeferredSetSet;
 import de.be4.classicalb.core.parser.node.AIdentifierExpression;
 import de.be4.classicalb.core.parser.node.Node;
-import de.be4.classicalb.core.parser.node.TIdentifierLiteral;
 import de.tlc4b.TLC4BGlobals;
 import de.tlc4b.analysis.Renamer;
 
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
+
 /**
  * 
  * This class represents an assignment in the configuration file. The left side
  * of the assignment is a constant and the right side a set of model values.
  * E.g. k = {k1, k2, k3}
  */
-
 public class SetOfModelValuesAssignment extends ConfigFileAssignment {
 	private final Node node;
 	private final int size;
 
 	public SetOfModelValuesAssignment(Node node, Integer size) {
 		this.node = node;
-		if (size == null) {
-			this.size = TLC4BGlobals.getDEFERRED_SET_SIZE();
-		} else {
-			this.size = size;
-		}
-
+		this.size = size == null ? TLC4BGlobals.getDEFERRED_SET_SIZE() : size;
 	}
 
 	public String getString(Renamer renamer) {
-		StringBuilder res = new StringBuilder();
-
-		StringBuilder conString;
+		String conString;
 		if (node instanceof ADeferredSetSet) {
-			conString = new StringBuilder();
-			List<TIdentifierLiteral> copy = ((ADeferredSetSet) node)
-					.getIdentifier();
-			for (TIdentifierLiteral e : copy) {
-				conString.append(e.getText());
-			}
-			conString = new StringBuilder(renamer.getName(node));
+			conString = renamer.getName(node);
 		} else {
-			AIdentifierExpression id = (AIdentifierExpression) node;
-			conString = new StringBuilder(getIdentifier(id));
+			conString = getIdentifier((AIdentifierExpression) node);
 		}
 
-		res.append(conString).append(" = {");
-		for (int j = 1; j < size + 1; j++) {
-			res.append(conString).append(j);
-			if (j < size) {
-				res.append(",");
-			}
-		}
-		res.append("}\n");
-
-		return res.toString();
+		return conString + " = {" +
+				IntStream.rangeClosed(1, size).mapToObj(j -> conString + j).collect(Collectors.joining(",")) +
+				"}\n";
 	}
-
 }
diff --git a/src/main/java/de/tlc4b/tlc/TLCOutputInfo.java b/src/main/java/de/tlc4b/tlc/TLCOutputInfo.java
index ed5a7bd500f44cc89c37fd010b25a63e8e70bfdd..1a5407bd1ace82e3187999fd9d092928b3d9e34d 100644
--- a/src/main/java/de/tlc4b/tlc/TLCOutputInfo.java
+++ b/src/main/java/de/tlc4b/tlc/TLCOutputInfo.java
@@ -63,14 +63,11 @@ public class TLCOutputInfo {
 		identifiers.putAll(machineContext.getEnumValues());
 		//TODO add sets of modelvalues
 		
-		
-		for (Entry<String, Node> entry : identifiers.entrySet()) {
-			String name = entry.getKey();
-			Node node = entry.getValue();
+		identifiers.forEach((name, node) -> {
 			String newName = renamer.getNameOfRef(node);
 			namesMapping.put(newName, name);
 			typesTable.put(newName, typechecker.getType(node));
-		}
+		});
 	}
 
 }
diff --git a/src/main/java/de/tlc4b/tlc/TracePrinter.java b/src/main/java/de/tlc4b/tlc/TracePrinter.java
index 6e5fd3eb22f8e87fe234dd31ac78ec7c84c8e848..7a4d7dc3b154d393f2b222e110368e33eb8ceeba 100644
--- a/src/main/java/de/tlc4b/tlc/TracePrinter.java
+++ b/src/main/java/de/tlc4b/tlc/TracePrinter.java
@@ -147,8 +147,7 @@ public class TracePrinter {
 				} else {
 					BType subtype = ((FunctionType) type).getRange();
 					res.append("[");
-					res.append(parseEnumerationValue(((TupleValue) val).elems,
-							subtype));
+					res.append(parseEnumerationValue(((TupleValue) val).elems, subtype));
 					res.append("]");
 				}
 				return res;