https://search.censys.io/certificates?q=parsed.issuer.organization.raw%3A+%22Let%27s+Encrypt%22+and+NOT+tags.raw%3A+%22precert%22

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Query Expansion

Censys expands queries to provide additional functionality. For
example, the query a:zmap.io executes a DNS lookup and expands to
ip:141.212.120.90.

Your query was changed from:

parsed.issuer.organization.raw: "Let's Encrypt" and NOT tags.raw: "precert"

to

parsed.issuer.organization.raw: "Let's Encrypt" AND NOT tags.raw: "precert"


If this isn't what you intended, you can run your raw query without
expansion.

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