CREATE TABLE table_50606 ("Oklahoma vs." TEXT, "Overall Record" TEXT, "at Norman" TEXT, "at Opponent's Venue" TEXT, "at Neutral Site" TEXT, "Last 5 Meetings" TEXT, "Last 10 Meetings" TEXT, "Current Streak" TEXT, "Since Beginning of Big 12" TEXT)

what is the current streak when the last 5 meetings is osu, 4-1?
SELECT "Current Streak" FROM table_50606 WHERE "Last 5 Meetings" = 'osu, 4-1'
SELECT "Current Streak" FROM "table_50606" WHERE "Last 5 Meetings" = 'osu, 4-1'