No TPTP formula. May not be expressible in strict first order.	UXExperimentalTerms.kif 951-951	The number 2 argument of web seller is an instance of web site
No TPTP formula. May not be expressible in strict first order.	ComputerInput.kif 2949-2949	The number 2 argument of web visitor is an instance of web site
No TPTP formula. May not be expressible in strict first order.	UXExperimentalTerms.kif 682-682	The number 3 argument of web cart is an instance of web site

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Sigma version 3.0 is open source software produced by Articulate Software and its partners