diff --git a/src/main/java/EseqExp.java b/src/main/java/EseqExp.java
deleted file mode 100644
index a9902cf..0000000
--- a/src/main/java/EseqExp.java
+++ /dev/null
@@ -1,18 +0,0 @@
-public class EseqExp extends Exp {
-
-   public final Stm stm;
-   public final Exp exp;
-
-   public EseqExp(Stm stm, Exp exp) {
-      this.stm = stm;
-      this.exp = exp;
-   }
-
-   @Override
-   public String toString() {
-      return "EseqExp{" +
-             "stm=" + stm +
-             ", exp=" + exp +
-             '}';
-   }
-}
diff --git a/src/main/java/IdExp.java b/src/main/java/IdExp.java
deleted file mode 100644
index 32ba2df..0000000
--- a/src/main/java/IdExp.java
+++ /dev/null
@@ -1,14 +0,0 @@
-public class IdExp extends Exp {
-   public final String id;
-
-   public IdExp(String id) {
-      this.id = id;
-   }
-
-   @Override
-   public String toString() {
-      return "IdExp{" +
-             "id='" + id + '\'' +
-             '}';
-   }
-}
diff --git a/src/main/java/Main.java b/src/main/java/Main.java
index 24a7a0d..8e6dc16 100644
--- a/src/main/java/Main.java
+++ b/src/main/java/Main.java
@@ -14,5 +14,6 @@ public static void main(String[] args) {
 
       System.out.println(p);
 
+
    }
 }
diff --git a/src/main/java/Main.java~ b/src/main/java/Main.java~
new file mode 100644
index 0000000..24a7a0d
--- /dev/null
+++ b/src/main/java/Main.java~
@@ -0,0 +1,18 @@
+import javaslang.collection.List;
+
+public class Main {
+
+   public static void main(String[] args) {
+
+      Stm p = new CompoundStm(new AssignStm("x",
+                                            new OpExp(new NumExp(2),
+                                                      new OpExp(new NumExp(3),
+                                                                new NumExp(4),
+                                                                OpExp.Op.TIMES),
+                                                      OpExp.Op.PLUS)),
+                              new PrintStm(List.of(new IdExp("x"))));
+
+      System.out.println(p);
+
+   }
+}
diff --git a/src/main/java/NumExp.java b/src/main/java/NumExp.java
deleted file mode 100644
index 1e070b9..0000000
--- a/src/main/java/NumExp.java
+++ /dev/null
@@ -1,14 +0,0 @@
-public class NumExp extends Exp {
-   public final int num;
-
-   public NumExp(int num) {
-      this.num = num;
-   }
-
-   @Override
-   public String toString() {
-      return "NumExp{" +
-             "num=" + num +
-             '}';
-   }
-}
diff --git a/src/main/java/OpExp.java b/src/main/java/OpExp.java
deleted file mode 100644
index a25cf35..0000000
--- a/src/main/java/OpExp.java
+++ /dev/null
@@ -1,23 +0,0 @@
-public class OpExp extends Exp {
-
-   public enum Op { PLUS, MINUS, TIMES, DIV }
-
-   public final Exp left;
-   public final Exp right;
-   public final Op op;
-
-   public OpExp(Exp left, Exp right, Op op) {
-      this.left = left;
-      this.right = right;
-      this.op = op;
-   }
-
-   @Override
-   public String toString() {
-      return "OpExp{" +
-             "left=" + left +
-             ", right=" + right +
-             ", op=" + op +
-             '}';
-   }
-}