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   Trackball
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| appearance as argument number 1 |
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| No TPTP formula. May not be expressible in strict first order. | ComputerInput.kif 608-611 | |
| No TPTP formula. May not be expressible in strict first order. | ComputerInput.kif 606-606 | Trackball is a subclass of computer input device |
| appearance as argument number 2 |
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| No TPTP formula. May not be expressible in strict first order. | ComputerInput.kif 613-613 | Joystick is disjoint from trackball |
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 65617-65617 |
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