Every 1:00 x 5 (5 mins):
5 Deadlifts @60%
-- then --
Every 1:15 x 4 (5 mins):
4 Deadlifts, 70% 1RM
-- then --
Every 1:30 x 3 (4:30):
3 Deadlifts, 80% 1RM
-- then --
Every 2:00 x 2 (4 mins):
2 Deadlifts, 85% 1RM