diff --git a/fuzzer/Fuzzer.java b/fuzzer/Fuzzer.java
index 4ea3793c44732a161c1f9f1b4aa5a803212c13ae..1d8a8c0a2cfda5c1b1678325d9b5b1b267c333ad 100644
--- a/fuzzer/Fuzzer.java
+++ b/fuzzer/Fuzzer.java
@@ -23,7 +23,7 @@ public class Fuzzer {
             Random rg = new Random();
          
             
-        }catch (Exception e){s
+        }catch (Exception e){
             e.printStackTrace(System.err);
             System.exit(1); 
         }finally{
@@ -188,8 +188,15 @@ public class Fuzzer {
     }
 
     //DZL
-    public String generateOffsetOverFlow() {
-    	return null;
+    public String generateOffsetOverFlow(Random rg) {
+    	String line = new String();
+    	Boolean positive = rg.nextBoolean();
+    	if(!positive) {
+        line.concat("MOV R0 -70000");	
+    	}else {
+    	line.concat("MOV R0 70000");
+    	}
+    	return line;
     }
     
     public String generateLineOverFlow() {
@@ -220,9 +227,14 @@ public class Fuzzer {
     	return line;
     }
     
-    //DZL
     public String generateDirtyRegistyRead() {
-    	return null;
+    	String line = new String();
+
+    	for(int x=1;x<maxRegistry-1;x++) {   
+    		line.concat("ADD R0 R0 R"+x+"%n");
+    	}
+    	line.concat("RET R0");
+    	return line;
     }
     
     public String generateDirtyMemoryRead(Random rg) {
@@ -282,11 +294,22 @@ public class Fuzzer {
     	return line;
     }
     
-    //DZL
     public String generateInvalidOperands(Random rg) {
-    	//rg.nextInt(3)
-    	//register = rg.nextInt(maxRegistry);
-    	//wrong operands
+    	int regs = rg.nextInt(4);
+    	String line = new String();
+    	Boolean hasval = rg.nextBoolean();
+    	int index = rg.nextInt(validOpcodes.size());
+        String opcode = validOpcodes.get(index);
+        line.concat(opcode);
+        for(int x=0;x<regs;x++) {
+        	int register = rg.nextInt(maxRegistry);
+        	line.concat(" R"+register);
+        }
+        if(hasval) {
+        	int value=rg.nextInt(maxMemory);
+        	line.concat(" "+value);
+        }
+
     	//too many arguments
     	return null;
     }