SHELL_SCRIPT
  COMMANDS_LIST
    SIMPLE_COMMAND
      GENERIC_COMMAND_DIRECTIVE
        LITERAL
          PsiElement(word)('echo')
      PsiWhiteSpace(' ')
      SIMPLE_COMMAND_ELEMENT
        COMMAND_SUBSTITUTION_COMMAND
          PsiElement(OPEN_BACKQUOTE)('`')
          COMPOUND_LIST
            SIMPLE_COMMAND
              GENERIC_COMMAND_DIRECTIVE
                LITERAL
                  PsiElement(word)('echo')
              PsiWhiteSpace(' ')
              LITERAL
                PsiElement(word)('a')
          PsiElement(CLOSE_BACKQUOTE)('`')
      PsiWhiteSpace(' ')
      SIMPLE_COMMAND_ELEMENT
        COMMAND_SUBSTITUTION_COMMAND
          PsiElement(OPEN_BACKQUOTE)('`')
          COMPOUND_LIST
            SIMPLE_COMMAND
              GENERIC_COMMAND_DIRECTIVE
                LITERAL
                  PsiElement(word)('echo')
              PsiWhiteSpace(' ')
              LITERAL
                PsiElement(word)('a')
          PsiElement(CLOSE_BACKQUOTE)('`')
  PsiElement(\n)('\n')
  COMMANDS_LIST
    SIMPLE_COMMAND
      COMMAND_SUBSTITUTION_COMMAND
        PsiElement(OPEN_BACKQUOTE)('`')
        COMPOUND_LIST
          GENERIC_COMMAND_DIRECTIVE
            LITERAL
              PsiElement(word)('echo')
        PsiWhiteSpace(' ')
        PsiElement(CLOSE_BACKQUOTE)('`')
      LITERAL
        PsiElement(word)('echo')
      PsiWhiteSpace(' ')
      LITERAL
        PsiElement(word)('one')
      SIMPLE_COMMAND_ELEMENT
        COMMAND_SUBSTITUTION_COMMAND
          PsiElement(OPEN_BACKQUOTE)('`')
          PsiWhiteSpace(' ')
          PsiElement(CLOSE_BACKQUOTE)('`')
      PsiWhiteSpace('  ')
      LITERAL
        PsiElement(word)('two')
      SIMPLE_COMMAND_ELEMENT
        COMMAND_SUBSTITUTION_COMMAND
          PsiElement(OPEN_BACKQUOTE)('`')
          PsiElement(CLOSE_BACKQUOTE)('`')