groups, status, position, group, studies, categories, classification, study, levels, value, system, significance, diversity, problems, units, characters, relationships, level, work, category, composition, revision, structure, hierarchy, approach, importance, notes, analysis, unit, purposes, systems, character, rank, implications, information, relations, criteria, scheme, methods, research, identification, treatment, distribution, literature, relationship, groupings, order, affinities, knowledge, names, data, differences, problem, schemes, features, description, classifications, confusion, species, method, descriptions, keys, principles, review, revisions, grouping, classes, divisions, richness, hierarchies, concepts, structures, characteristics, criterion, reference, considerations, framework, affinity, resolution, distance, name, practice, organization, distinctions, arrangement, identity, tool, key, ranks, distinction, differentiation, difficulties

important, numerical, more, classical, different, higher, various, greater, future, current, particular, extensive, modern, descriptive, appropriate, close, main