diff --git a/src/fr/neatmonster/nocheatplus/checks/chat/analysis/ds/PrefixTree.java b/src/fr/neatmonster/nocheatplus/checks/chat/analysis/ds/PrefixTree.java
index f9370317..5c2677e9 100644
--- a/src/fr/neatmonster/nocheatplus/checks/chat/analysis/ds/PrefixTree.java
+++ b/src/fr/neatmonster/nocheatplus/checks/chat/analysis/ds/PrefixTree.java
@@ -84,10 +84,40 @@ public class PrefixTree<K, N extends Node<K>, L extends LookupEntry<K, N>>{
 		this.resultFactory = resultFactory;
 	}
 	
-	public LookupEntry<K, N> lookup(K[] keys, final boolean create){
+	/**
+	 * Look up without creating new nodes.
+	 * @param keys
+	 * @return
+	 */
+	public L lookup(final K[] keys){
+		return lookup( keys, false);
+	}
+	
+	/**
+	 * Look up without creating new nodes.
+	 * @param keys
+	 * @return
+	 */
+	public L lookup(final List<K> keys){
+		return lookup( keys, false);
+	}
+	
+	/**
+	 * Look up sequence, if desired fill in the given sequence.
+	 * @param keys
+	 * @param create
+	 * @return
+	 */
+	public L lookup(K[] keys, final boolean create){
 		return lookup(Arrays.asList(keys), create);
 	}
 	
+	/**
+	 * Look up sequence, if desired fill in the given sequence.
+	 * @param keys
+	 * @param create
+	 * @return
+	 */
 	@SuppressWarnings("unchecked")
 	public L lookup(final List<K> keys, final boolean create){
 		N insertion = root;
@@ -121,6 +151,80 @@ public class PrefixTree<K, N extends Node<K>, L extends LookupEntry<K, N>>{
 		}
 		return resultFactory.newLookupEntry(node, insertion, depth, hasPrefix);
 	}
+	
+	/**
+	 * 
+	 * @param keys
+	 * @return If already inside (not necessarily as former end point).
+	 */
+	public boolean feed(final List<K> keys){
+		final L result = lookup(keys, true);
+		return result.insertion == result.node;
+	}
+	
+	/**
+	 * 
+	 * @param chars
+	 * @return If already inside (not necessarily as former end point).
+	 */
+	public boolean feed(final K[] keys){
+		return feed(Arrays.asList(keys));
+	}
+	
+	/**
+	 * Check if the tree has a prefix of keys. This does not mean a common prefix, but that the tree contains an end point that is a prefix of the input. 
+	 * @param keys
+	 * @return
+	 */
+	public boolean hasPrefix(final List<K> keys){
+		return lookup(keys, false).hasPrefix;
+	}
+	
+	/**
+	 * Check if the tree has a prefix of keys. This does not mean a common prefix, but that the tree contains an end point that is a prefix of the input. 
+	 * @param keys
+	 * @return
+	 */
+	public boolean hasPrefix(final K[] keys){
+		return hasPrefix(Arrays.asList(keys));
+	}
+	
+	/**
+	 * Check if the input is prefix of a path inside of the tree, need not be an end point.
+	 * @param keys
+	 * @return
+	 */
+	public boolean isPrefix(final List<K> keys){
+		return lookup(keys, false).depth == keys.size();
+	}
+	
+	/**
+	 * Check if the input is prefix of a path inside of the tree, need not be an end point.
+	 * @param keys
+	 * @return
+	 */
+	public boolean isPrefix(final K[] keys){
+		return isPrefix(Arrays.asList(keys));
+	}
+	
+	/**
+	 * Check if the input is an inserted sequence (end point), but not necessarily a leaf.
+	 * @param keys
+	 * @return
+	 */
+	public boolean matches(final List<K> keys){
+		final L result = lookup(keys, false);
+		return result.node == result.insertion && result.insertion.isEnd;
+	}
+	
+	/**
+	 * Check if the input is an inserted sequence (end point), but not necessarily a leaf.
+	 * @param keys
+	 * @return
+	 */
+	public boolean matches(final K[] keys){
+		return matches(Arrays.asList(keys));
+	}
 
 	public void clear() {
 		root = nodeFactory.newNode(null);
diff --git a/src/fr/neatmonster/nocheatplus/checks/chat/analysis/ds/SimpleCharPrefixTree.java b/src/fr/neatmonster/nocheatplus/checks/chat/analysis/ds/SimpleCharPrefixTree.java
new file mode 100644
index 00000000..0b4372ee
--- /dev/null
+++ b/src/fr/neatmonster/nocheatplus/checks/chat/analysis/ds/SimpleCharPrefixTree.java
@@ -0,0 +1,97 @@
+package fr.neatmonster.nocheatplus.checks.chat.analysis.ds;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+/**
+ * Adding some convenience methods.
+ * @author mc_dev
+ *
+ */
+public class SimpleCharPrefixTree extends SimplePrefixTree<Character>{
+	
+	/**
+	 * Auxiliary method to get a List of Character.
+	 * @param chars
+	 * @return
+	 */
+	public static final List<Character> toCharacterList(final char[] chars){
+		final List<Character> characters = new ArrayList<Character>(chars.length);
+		for (int i = 0; i < chars.length; i++){
+			characters.add(chars[i]);
+		}
+		return characters;
+	}
+	
+	/**
+	 * 
+	 * @param chars
+	 * @param create
+	 * @return
+	 */
+	public SimpleLookupEntry<Character> lookup(final char[] chars, boolean create){
+		return lookup(toCharacterList(chars), create);
+	}
+	
+	/**
+	 * 
+	 * @param chars
+	 * @param create
+	 * @return
+	 */
+	public SimpleLookupEntry<Character> lookup(final String input, boolean create){
+		return lookup(input.toCharArray(), create);
+	}
+	
+	/**
+	 * 
+	 * @param chars
+	 * @return If already inside (not necessarily as former end point).
+	 */
+	public boolean feed(final String input){
+		return feed(input.toCharArray());
+	}
+
+	/**
+	 * 
+	 * @param chars
+	 * @return If already inside (not necessarily as former end point).
+	 */
+	public boolean feed(final char[] chars){
+		return feed(toCharacterList(chars));
+	}
+	
+	public void feedAll(final Collection<String> inputs, boolean trim, boolean lowerCase){
+		for (String input : inputs){
+			if (trim) input = input.toLowerCase();
+			if (lowerCase) input = input.toLowerCase();
+			feed(input);
+		}
+	}
+	
+	public boolean hasPrefix(final char[] chars){
+		return hasPrefix(toCharacterList(chars));
+	}
+	
+	public boolean hasPrefix(final String input){
+		return hasPrefix(input.toCharArray());
+	}
+	
+	public boolean isPrefix(final char[] chars){
+		return isPrefix(toCharacterList(chars));
+	}
+	
+	public boolean isPrefix(final String input){
+		return isPrefix(input.toCharArray());
+	}
+	
+	public boolean matches(final char[] chars){
+		return matches(toCharacterList(chars));
+	}
+	
+	public boolean matches(final String input){
+		return matches(input.toCharArray());
+	}
+	
+}