[EP-tech] Search filters: negation or searching for "either X or NULL"

[Dennis Müller]

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From: =?UTF-8?Q?Dennis_M=c3=bcller?= <dennis.mueller at uni-mannheim.de>
Subject: Re: Search filters: negation or searching for "either X or NULL"
Date: Mon, 20 Feb 2023 18:52:15 +0100
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