, (Lagos) , , ., . . 1,34 . (1991). . , ( 1960-91 ). , , . . , . 15 . . 1914-60 - .

, ( ) (Niemeyer Soares Filho) ( . 1907), , (1983). . , , ( , 1942-43; . , 1957; , 1966-1971). (1963).

, - (m) , ( x?y? n = ?????????). m (m = 2), (m = 3), n - (n = 1), (n = 2), (n = 3) . . . .

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