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| (subclass Radium ElementalSubstance) | Mid-level-ontology.kif 28791-28791 | |
| (subclass Radon ElementalSubstance) | Mid-level-ontology.kif 28757-28757 | |
| (subclass Rhenium ElementalSubstance) | Mid-level-ontology.kif 28550-28550 | |
| (subclass Rhodium ElementalSubstance) | Mid-level-ontology.kif 28013-28013 | |
| (subclass Rubidium ElementalSubstance) | Mid-level-ontology.kif 27871-27871 | |
| (subclass Ruthenium ElementalSubstance) | Mid-level-ontology.kif 27997-27997 | |
| (subclass Samarium ElementalSubstance) | Mid-level-ontology.kif 28316-28316 | |
| (subclass Scandium ElementalSubstance) | Mid-level-ontology.kif 27602-27602 | |
| (subclass Selenium ElementalSubstance) | Mid-level-ontology.kif 27820-27820 | |
| (subclass Silicon ElementalSubstance) | Mid-level-ontology.kif 27491-27491 | |
| (subclass Silver ElementalSubstance) | Mid-level-ontology.kif 28044-28044 | |
| (subclass Sodium ElementalSubstance) | Mid-level-ontology.kif 27439-27439 | |
| (subclass Strontium ElementalSubstance) | Mid-level-ontology.kif 27888-27888 | |
| (subclass SubatomicParticle ElementalSubstance) | Merge.kif 1133-1133 | |
| (subclass Sulphur ElementalSubstance) | Mid-level-ontology.kif 27523-27523 | |
| (subclass Tantalum ElementalSubstance) | Mid-level-ontology.kif 28517-28517 | |
| (subclass Technetium ElementalSubstance) | Mid-level-ontology.kif 27978-27978 | |
| (subclass Tellurium ElementalSubstance) | Mid-level-ontology.kif 28124-28124 | |
| (subclass Terbium ElementalSubstance) | Mid-level-ontology.kif 28370-28370 | |
| (subclass Thallium ElementalSubstance) | Mid-level-ontology.kif 28667-28667 | |
| (subclass Thorium ElementalSubstance) | Mid-level-ontology.kif 28825-28825 | |
| (subclass Thulium ElementalSubstance) | Mid-level-ontology.kif 28448-28448 | |
| (subclass Tin ElementalSubstance) | Mid-level-ontology.kif 28091-28091 | |
| (subclass Titanium ElementalSubstance) | Mid-level-ontology.kif 27618-27618 | |
| (subclass Tungsten ElementalSubstance) | Mid-level-ontology.kif 28534-28534 | |
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