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Note that the PEP system can only accommodate a single file in any given cell. If multiple files should be stored together (e.g. because the files would be useless individually, or because the data format requires it), the files must be packaged into a single file (e.g. a `tar` archive) before being `pepcli store`d. Downloaders will then receive the packaged file, which they should process accordingly.
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## Data format processing
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As [mentioned earlier](#Uploading-data), uploaders will usually specify a short pseudonym to indicate where their data should be stored in PEP. Such short pseudonyms [should not be exposed](#Pseudonymization) to downloaders, since that would provide them with a fixed identifier for the data sample (and hence for the participant). The uploader should therefore ensure that any short pseudonyms (or other identifying information for that matter) are removed from the data before it is uploaded into PEP.
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PEP provides built-in facilities to automate pseudonym removal for some data formats @@@ more here @@@
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PEP provides built-in processing facilities for some data formats. See the section on that topic @@@link@@@ for details.
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## 2. List data from PEP e.g. to retrieve a short pseudonym
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