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           .file ...
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positive.code:       .children
          .file ...
        .file app.component.ts|html|css|spec.ts
        .file main.ts
      .file index.html
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negative.code:         .file ...
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        .file app.component.ts|html|css|spec.ts
      .file main.ts
      .file index.html
      .file ...
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