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fix: recognise set operation quantifiers written in any case (#2614) #819

Job	Run time
Grammar Choice Conflicts	47s
Gradle Check (windows-latest)	4m 18s
Gradle Check (macos-latest)	3m 14s
Gradle Check (ubuntu-latest)	3m 20s
Maven Verify (windows-latest)	3m 37s
Maven Verify (ubuntu-latest)	2m 51s
Maven Verify (macos-latest)	4m 23s
Build & Deploy Sphinx Docs	3m 10s
Gradle Publish (Maven Central)	3m 58s
	29m 38s