CREATE TABLE table_49471 ("Game" TEXT, "Date" TEXT, "Home team" TEXT, "Result" TEXT, "Road team" TEXT)

Which Road team has a Home team of portland, and a Date of may 31?
SELECT "Road team" FROM table_49471 WHERE "Home team" = 'portland' AND "Date" = 'may 31'
SELECT "Road team" FROM "table_49471" WHERE "Date" = 'may 31' AND "Home team" = 'portland'