Apologies, disregard my former message! I overlloked the requirement that only combinations
present in the data must be taken. ft.


--
Fernando TUSELL e-mail:
Departamento de Econometría y Estadística [EMAIL PROTECTED] Facultad de CC.EE. y Empresariales Tel: (+34)94.601.3733
Avenida Lendakari Aguirre, 83 Fax: (+34)94.601.3754
E-48015 BILBAO (Spain) Secr: (+34)94.601.3740


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