CREATE TABLE table_36516 ("Result" TEXT, "Opponent" TEXT, "Method" TEXT, "Event" TEXT, "Date" TEXT, "Round" TEXT, "Time" TEXT, "Location" TEXT, "Rules" TEXT)

Which Opponent has a Round of 4, and a Rules of thai boxing?
SELECT "Opponent" FROM table_36516 WHERE "Round" = '4' AND "Rules" = 'thai boxing'
SELECT "Opponent" FROM "table_36516" WHERE "Round" = '4' AND "Rules" = 'thai boxing'