(Statements
{ (Import
  {-(Alias
    {-(Identifier)-}
    {-(Identifier)-})-})
->(Import
  {+(Alias
    {+(Identifier)+}
    {+(Identifier)+})+}) }
{ (Import
  {-(Alias
    {-(Identifier)-}
    {-(Identifier)-})-}
  {-(Alias
    {-(Identifier)-}
    {-(Identifier)-})-})
->(Import
  {+(Alias
    {+(Identifier)+}
    {+(Identifier)+})+}
  {+(Alias
    {+(Identifier)+}
    {+(Identifier)+})+}) }
{ (Import)
->(Import) }
{+(Import
  {+(Alias
    {+(Identifier)+}
    {+(Identifier)+})+})+}
{+(Import
  {+(Alias
    {+(Identifier)+}
    {+(Identifier)+})+})+}
{-(Import
  {-(Alias
    {-(Identifier)-}
    {-(Identifier)-})-}
  {-(Alias
    {-(Identifier)-}
    {-(Identifier)-})-})-}
{-(Import
  {-(Alias
    {-(Identifier)-}
    {-(Identifier)-})-})-}
{-(Import
  {-(Alias
    {-(Identifier)-}
    {-(Identifier)-})-})-})