CREATE TABLE table_6246 ("Windows" TEXT, "Mac OS X" TEXT, "Linux" TEXT, "Other Unix" TEXT, "AmigaOS" TEXT, "Android" TEXT, "Windows Mobile" TEXT)

Which Mac OS X has a Linux of no, and an AmigaOS of no, and an Android of unknown?
SELECT "Mac OS X" FROM table_6246 WHERE "Linux" = 'no' AND "AmigaOS" = 'no' AND "Android" = 'unknown'
SELECT "Mac OS X" FROM "table_6246" WHERE "AmigaOS" = 'no' AND "Android" = 'unknown' AND "Linux" = 'no'