https://rules.gitlabpages.inria.fr/integraal/fr.lirmm.integraal.rule_analysis/fr/lirmm/graphik/util/stream/UniqIterator.html
UniqIterator (InteGraal : Knowledge-Representation and Reasoning for Data Integration 3.0.1 API)
declaration: module: fr.lirmm.integraal.rule_analysis, package: fr.lirmm.graphik.util.stream, class: UniqIterator