| appearance as argument number 1 |
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| No TPTP formula. May not be expressible in strict first order. | Mid-level-ontology.kif 9895-9895 | Acidity measure is a subclass of unit of measure |
| appearance as argument number 2 |
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| No TPTP formula. May not be expressible in strict first order. | Mid-level-ontology.kif 9896-9896 | Potential of hydrogen is an instance of acidity measure |
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 64405-64405 |
| appearance as argument number 3 |
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| No TPTP formula. May not be expressible in strict first order. | Mid-level-ontology.kif 9893-9893 | The number 2 argument of pH measure is an instance of acidity measure |
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Sigma version 3.0 is open source software produced by Articulate Software and its partners