CREATE TABLE table_59623 ("Tie no" CLOB, "Home team" CLOB, "Score" CLOB, "Away team" CLOB, "Date" CLOB)

Which away team played against Peterborough United, with a tie no of replay?
SELECT "Away team" FROM table_59623 WHERE "Tie no" = 'replay' AND "Home team" = 'peterborough united'
SELECT "Away team" FROM "table_59623" WHERE "Home team" = 'peterborough united' AND "Tie no" = 'replay'