BEGIN Var1 := Var2 + Var3;
Var3 := Var4 ;
Var4 := Var5 - Var6
END
System output should be:
BEGIN Var1 := Var2 + Var3;
Var2 + Var3 = 20
Var3 := Var4 ;
Var4 := Var5 - Var6
Var5 - Var6 = 0
END