Question: what is the result when extra is 4 x 100 m relay and the year is later than 1971?
SQL: SELECT "Result" FROM "2-12070470-1" WHERE "Extra" = '4 x 100 m relay' AND "Year" > 1971.0;

Question: what is the venue when the result is 2nd and extra is 4 x 100 m relay?
SQL: SELECT "Venue" FROM "2-12070470-1" WHERE "Result" = '2nd' AND "Extra" = '4 x 100 m relay';