Table: elfgard_sofia_1971
Columns: year
tournament
venue
result
extra

Question: what is the result when extra is 4 x 100 m relay and the year is later than 1971?
SQL: SELECT "result" FROM elfgard_sofia_1971 WHERE "extra" = '4 x 100 m relay' AND "year" > 1971

Question: what is the venue when the result is 2nd and extra is 4 x 100 m relay?
SQL: SELECT "venue" FROM elfgard_sofia_1971 WHERE "result" = '2nd' AND "extra" = '4 x 100 m relay'