CREATE TABLE table_46448 ("Tournament" TEXT, "1984" TEXT, "1985" TEXT, "1986" TEXT, "1987" TEXT, "1988" TEXT, "1989" TEXT, "1990" TEXT, "1991" TEXT, "1992" TEXT, "1993" TEXT, "1994" TEXT, "1995" TEXT, "1996" TEXT, "1997" TEXT, "1998" TEXT, "1999" TEXT, "2000" TEXT)

What is the 1986 value with A in 1991 and A in 1987?
SELECT "1986" FROM table_46448 WHERE "1991" = 'a' AND "1987" = 'a'
SELECT "1986" FROM "table_46448" WHERE "1987" = 'a' AND "1991" = 'a'