Table:
text: Missouri Tigers men's basketball
Record vs. Other opponents (at least 15 games played)
Record vs. Other opponents (at least 15 games played)
Missouri_vs_ Overall_Record at_Columbia at_Opponents_Venue at_Neutral_Site Last_5_Meetings Last_10_Meetings Current_Streak
Nebraska MU, 126-93 MU, 70-25 NU, 56-42 MU, 14-12 MU, 3-2 Tied, 5-5 L 1
Saint Louis MU, 21-19 SLU, 12-10 MU, 11-7 Tied, 0-0 MU, 3-2 Tied, 5-5 W 2
Washington U. of StL MU, 71-29 MU, 42-8 MU, 29-21 Tied, 0-0 MU, 5-0 MU, 8-2 W 7

Question: How many times has the Missouri Tigers men's basketball team achieved an overall record of mu, 21-19 with their record against other opponents of at least 15 games played?