CREATE TABLE table_52121 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

Which Away team score has a Venue of princes park?
SELECT "Away team score" FROM table_52121 WHERE "Venue" = 'princes park'
SELECT "Away team score" FROM "table_52121" WHERE "Venue" = 'princes park'