| appearance as argument number 1 |
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| No TPTP formula. May not be expressible in strict first order. | Economy.kif 4008-4009 | |
| No TPTP formula. May not be expressible in strict first order. | Economy.kif 4007-4007 | Oat grass is a subclass of cereal grass plant |
| appearance as argument number 2 |
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| No TPTP formula. May not be expressible in strict first order. | Economy.kif 4124-4124 | Every oat grain is initially part of a oat grass |
| No TPTP formula. May not be expressible in strict first order. | Economy.kif 4010-4010 |
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