grouping(kingdom = NULL, subkingdom = NULL, infrakingdom = NULL,
division = NULL, phylum = NULL, subdivision = NULL,
infradavision = NULL, superclass = NULL, clazz = NULL,
subclass = NULL, infraclass = NULL, superorder = NULL, order = NULL,
suborder = NULL, infraorder = NULL, superfamily = NULL, family = NULL,
subfamily = NULL, tribe = NULL, subtribe = NULL, genus = NULL,
subgenus = NULL, section = NULL, subsection = NULL, species = NULL,
subspecies = NULL, variety = NULL, race = NULL, subvariety = NULL,
stirp = NULL, morph = NULL, form = NULL, aberration = NULL,
subform = NULL, unspecified = NULL)
grouping(kingdom=taxonref("kingdom", "Animalia"),
species=taxonref("species", "Homo sapiens"))
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