CREATE TABLE table_54824 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

What was the crowd size on 4 july 1981, and a Away team of essendon?
SELECT "Crowd" FROM table_54824 WHERE "Date" = '4 july 1981' AND "Away team" = 'essendon'
SELECT "Crowd" FROM "table_54824" WHERE "Away team" = 'essendon' AND "Date" = '4 july 1981'