CREATE TABLE table_19681 ("Year" FLOAT, "Mens singles" CLOB, "Womens singles" CLOB, "Mens doubles" CLOB, "Womens doubles" CLOB, "Mixed doubles" CLOB)

Who won mens singles the year sveinn logi s lvason tryggvi nilsen won mens doubles and elsa nielsen won womens singles
SELECT "Mens singles" FROM table_19681 WHERE "Mens doubles" = 'Sveinn Logi Sölvason Tryggvi Nilsen' AND "Womens singles" = 'Elsa Nielsen'
SELECT "Mens singles" FROM "table_19681" WHERE "Mens doubles" = 'Sveinn Logi Sölvason Tryggvi Nilsen' AND "Womens singles" = 'Elsa Nielsen'