at the Edward Jones Dome, St. Louis, Missouri Coming off a surprising road victory over the Saints, the Redskins flew to the Edward Jones Dome for a Week 16 fight with the St. Louis Rams.  In the first quarter, the 'Skins struck first with RB T. J. Duckett's 5-yard TD run for the only score of the period.  In the second quarter, the Rams took the lead with QB Marc Bulger completing a 10-yard TD pass to WR Isaac Bruce and a 27-yard TD pass to TE Dominique Byrd. Washington responded with RB Ladell Betts getting a 6-yard TD run and QB Jason Campbell completing a 9-yard TD pass to TE Chris Cooley.  In the third quarter, the Redskins' lead increased with Betts' 7-yard TD run.  However, St. Louis started rally with Bulger completing a 64-yard TD pass to RB Steven Jackson and a 10-yard TD pass to RB Stephen Davis.  In the fourth quarter, the Rams took the lead with kicker Jeff Wilkins nailing a 21-yard field goal. The Washington forced overtime with kicker Shaun Shisham's 52-yard field goal. However, the 'Skins fell in overtime as Stephen Jackson delivered the game-winning 21-yard TD run for the Rams.  With the loss, the Redskins fell to 5-10. Stats
Answer this question: How many yards difference is there between the longest TD run and the shortest TD run?
16