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| (subclass Radium ElementalSubstance) | Mid-level-ontology.kif 28779-28779 | |
| (subclass Radon ElementalSubstance) | Mid-level-ontology.kif 28745-28745 | |
| (subclass Rhenium ElementalSubstance) | Mid-level-ontology.kif 28538-28538 | |
| (subclass Rhodium ElementalSubstance) | Mid-level-ontology.kif 28001-28001 | |
| (subclass Rubidium ElementalSubstance) | Mid-level-ontology.kif 27859-27859 | |
| (subclass Ruthenium ElementalSubstance) | Mid-level-ontology.kif 27985-27985 | |
| (subclass Samarium ElementalSubstance) | Mid-level-ontology.kif 28304-28304 | |
| (subclass Scandium ElementalSubstance) | Mid-level-ontology.kif 27590-27590 | |
| (subclass Selenium ElementalSubstance) | Mid-level-ontology.kif 27808-27808 | |
| (subclass Silicon ElementalSubstance) | Mid-level-ontology.kif 27479-27479 | |
| (subclass Silver ElementalSubstance) | Mid-level-ontology.kif 28032-28032 | |
| (subclass Sodium ElementalSubstance) | Mid-level-ontology.kif 27427-27427 | |
| (subclass Strontium ElementalSubstance) | Mid-level-ontology.kif 27876-27876 | |
| (subclass SubatomicParticle ElementalSubstance) | Merge.kif 1133-1133 | |
| (subclass Sulphur ElementalSubstance) | Mid-level-ontology.kif 27511-27511 | |
| (subclass Tantalum ElementalSubstance) | Mid-level-ontology.kif 28505-28505 | |
| (subclass Technetium ElementalSubstance) | Mid-level-ontology.kif 27966-27966 | |
| (subclass Tellurium ElementalSubstance) | Mid-level-ontology.kif 28112-28112 | |
| (subclass Terbium ElementalSubstance) | Mid-level-ontology.kif 28358-28358 | |
| (subclass Thallium ElementalSubstance) | Mid-level-ontology.kif 28655-28655 | |
| (subclass Thorium ElementalSubstance) | Mid-level-ontology.kif 28813-28813 | |
| (subclass Thulium ElementalSubstance) | Mid-level-ontology.kif 28436-28436 | |
| (subclass Tin ElementalSubstance) | Mid-level-ontology.kif 28079-28079 | |
| (subclass Titanium ElementalSubstance) | Mid-level-ontology.kif 27606-27606 | |
| (subclass Tungsten ElementalSubstance) | Mid-level-ontology.kif 28522-28522 | |
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