SHELL_SCRIPT
  COMMANDS_LIST
    SUBSHELL_COMMAND
      PsiElement(()('(')
      COMPOUND_LIST
        SIMPLE_COMMAND
          GENERIC_COMMAND_DIRECTIVE
            LITERAL
              PsiElement(word)('echo')
          PsiWhiteSpace(' ')
          LITERAL
            PsiElement(word)('a')
        PsiWhiteSpace(' ')
        PsiElement(&)('&')
      PsiElement())(')')
  PsiElement(\n)('\n')
  COMMANDS_LIST
    SUBSHELL_COMMAND
      PsiElement(()('(')
      COMPOUND_LIST
        SIMPLE_COMMAND
          GENERIC_COMMAND_DIRECTIVE
            LITERAL
              PsiElement(word)('echo')
          PsiWhiteSpace(' ')
          LITERAL
            PsiElement(word)('a')
      PsiElement())(')')