CREATE TABLE table_42376 ("Team 1" TEXT, "Agg." TEXT, "Team 2" TEXT, "1st leg" TEXT, "2nd leg" TEXT)

What is the 2nd leg that has 31-37 as the 1st leg?
SELECT "2nd leg" FROM table_42376 WHERE "1st leg" = '31-37'
SELECT "2nd leg" FROM "table_42376" WHERE "1st leg" = '31-37'