| appearance as argument number 1 |
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| No TPTP formula. May not be expressible in strict first order. | ComputerInput.kif 378-379 | |
| No TPTP formula. May not be expressible in strict first order. | ComputerInput.kif 377-377 | Computer keypad is a subclass of generic computer keyboard |
| appearance as argument number 2 |
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| No TPTP formula. May not be expressible in strict first order. | ComputerInput.kif 465-465 | Computer touchscreen keypad is a subclass of computer keypad |
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 64690-64690 |
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Sigma version 3.0 is open source software produced by Articulate Software and its partners