diff --git a/src/main/java/chocopy/pa3/CodeGenImpl.java b/src/main/java/chocopy/pa3/CodeGenImpl.java
index 6d522cf..7376ce0 100644
--- a/src/main/java/chocopy/pa3/CodeGenImpl.java
+++ b/src/main/java/chocopy/pa3/CodeGenImpl.java
@@ -32,12 +32,12 @@ public class CodeGenImpl extends CodeGenBase
 {
     /** Label for built-in routines. */
     protected final Label makeintLabel = new Label("makeint");
-    protected final Label strneqlLablel = new Label("strneql");
-    protected final Label streqlLablel = new Label("streql");
+    protected final Label strneqlLabel = new Label("strneql");
+    protected final Label streqlLabel = new Label("streql");
     protected final Label makeboolLabel = new Label("makebool");
-    protected final Label strcatLablel = new Label("strcat");
-    protected final Label concatLablel = new Label("concat");
-    protected final Label conslistLablel = new Label("conslist");
+    protected final Label strcatLabel = new Label("strcat");
+    protected final Label concatLabel = new Label("concat");
+    protected final Label conslistLabel = new Label("conslist");
 
 
     
@@ -709,24 +709,42 @@ public class CodeGenImpl extends CodeGenBase
             }
             else if(node.left.getInferredType().isListType() && node.right.getInferredType().isListType())
             {
-                node.right.dispatch(this);
-                backend.emitSW(Register.A0, Register.FP, -sp_off*wordSize, "Push on stack slot "+sp_off);
-                incSp(1);
-                node.left.dispatch(this);
-                sp_off--;
-                backend.emitLW(Register.T0, Register.FP, -sp_off*wordSize, "Pop stack slot "+sp_off);
                 if(operator.equals("+"))
-                    addLists();
+                {
+                    node.left.dispatch(this);
+                    backend.emitSW(Register.A0, Register.FP, -sp_off*wordSize, "Push left operand on stack slot "+sp_off);
+                    incSp(1);
+                    node.right.dispatch(this);
+                    backend.emitSW(Register.A0, Register.FP, -sp_off*wordSize, "Push right operand on stack slot "+sp_off);
+                    incSp(1);
+                    backend.emitADDI(Register.SP,Register.FP,-sp_off*wordSize,"Set SP to last argument");
+                    backend.emitJAL(concatLabel, "Call concatenation routine");
+                    backend.emitADDI(Register.SP, Register.FP, "-"+size_label, "Set SP to stack frame");
+                    return Register.A0;
+                    //addLists();
+                }
+                else
+                    backend.emitJAL(errorNI, "Operator not implemented for list operands");
+                 
             }
             else if(node.left.getInferredType().equals(Type.STR_TYPE) && node.right.getInferredType().equals(Type.STR_TYPE))
             {
+                if(operator.equals("=="))
+                {
                 incSp(2);
                 backend.emitSW(node.left.dispatch(this), FP, (1 - sp_off) *wordSize, "Push argument 0 from last.");
                 backend.emitSW(node.right.dispatch(this), FP, ( - sp_off) *wordSize, "Push argument 1 from last.");
                 backend.emitADDI(SP, FP, -sp_off * wordSize, "Set SP to last argument.");
-                backend.emitJAL(streqlLablel, "Invoke method:streql");
+                backend.emitJAL(streqlLabel, "Invoke method:streql");
                 sp_off -= 2;
                 backend.emitADDI(SP, FP, -sp_off*wordSize, "restore sp");
+                }
+                else if(operator.equals("+"))
+                {
+                    
+                }
+                else
+                    backend.emitJAL(errorNI, "Operator not implemented for String operands");
             }
             else if(operator.equals("is"))
             {
@@ -808,25 +826,33 @@ public class CodeGenImpl extends CodeGenBase
         @Override
         public Register analyze(ListExpr node) {
             int l = node.elements.size();
-            backend.emitLI(Register.A1, l+1, "Load length of list+1 in words");
-            backend.emitLA(Register.A0, listClass.getPrototypeLabel(), "Load empty list");
-            backend.emitJAL(objectAllocResizeLabel, "Allocate list");
-            backend.emitMV(Register.A1, Register.A0, "Store address of allocated space");
-            backend.emitMV(Register.T0, Register.A1, "Make a copy of address of allocated space");
-            
-            int i = l;
-            backend.emitLI(Register.A0,l,"Load length of list in words");
-            backend.emitSW(Register.A0,Register.T0,0,"Store length of list: "+i);
-            backend.emitADDI(Register.T0,Register.T0,wordSize,"Increment address");
-                
+            int i=l;
             for(Expr exp:node.elements)
             {
                 Register r = exp.dispatch(this);
-                backend.emitSW(r,Register.T0,0,"Store element "+i+" from last.");
-                backend.emitADDI(Register.T0,Register.T0,wordSize,"Increment address");
+                if (exp.getInferredType().equals(Type.INT_TYPE) && !node.elements.get(0).getInferredType().equals(Type.INT_TYPE))
+                {
+                    if(r!=Register.A0)
+                        backend.emitMV(r, Register.A0, "Copy to Register A0");
+                    backend.emitJAL(makeintLabel, "Box integer");
+                }
+                else if (exp.getInferredType().equals(Type.BOOL_TYPE) && !node.elements.get(0).getInferredType().equals(Type.BOOL_TYPE)) 
+                {
+                    if(r!=Register.A0)
+                        backend.emitMV(r, Register.A0, "Copy to Register A0");
+                    backend.emitJAL(makeboolLabel, "Box boolean");
+                }
+                backend.emitSW(Register.A0, Register.FP, -sp_off*wordSize, "Push argument "+i+" from last");
+                incSp(1);
                 i--;
             }
-            backend.emitMV(Register.A0,Register.A1,"Load address of list");
+            backend.emitLI(Register.A0, l, "Pass list length");
+            backend.emitSW(Register.A0, Register.FP, -sp_off*wordSize, "Push length of list");
+            incSp(1);
+            backend.emitADDI(Register.SP, Register.FP, -(sp_off-1)*wordSize, "Set SP to last argument");
+            backend.emitJAL(conslistLabel, "Move values to new list object");
+            backend.emitADDI(Register.SP, Register.FP, "-"+size_label, "Set SP to stack frame");
+            sp_off-=l;
             return Register.A0;
         }