CREATE TABLE table_75504 ("Season" CLOB, "Competition" CLOB, "Round" CLOB, "Club" CLOB, "Home result" CLOB, "Away result" CLOB)

Round of 2r, and a Home result of 0-0 has what season?
SELECT "Season" FROM table_75504 WHERE "Round" = '2r' AND "Home result" = '0-0'
SELECT "Season" FROM "table_75504" WHERE "Home result" = '0-0' AND "Round" = '2r'