CREATE TABLE table_52125 ("D 41 \\u221a" TEXT, "D 42 \\u221a" TEXT, "D 43 \\u221a" TEXT, "D 44 \\u221a" TEXT, "D 45 \\u221a" TEXT, "D 46 \\u221a" TEXT, "D 47 \\u221a" TEXT, "D 48 \\u221a" TEXT, "D 49 \\u221a" TEXT, "D 50 O" TEXT)

What is the D48 when the D 50 O is d 31?
SELECT "D 48 \u221a" FROM table_52125 WHERE "D 50 O" = 'd 31'
SELECT "D 48 \u221a" FROM "table_52125" WHERE "D 50 O" = 'd 31'