Roll one: 4d6 ⇒ (6, 1, 6, 4) = 17-1 = 16
Roll two: 4d6 ⇒ (3, 5, 6, 2) = 16-2 = 14
Roll three: 4d6 ⇒ (3, 6, 2, 3) = 14-2 = 12
Roll four: 4d6 ⇒ (2, 4, 6, 2) = 14-2 = 12
Roll five: 4d6 ⇒ (1, 4, 3, 2) = 10-1 = 9
Roll six: 4d6 ⇒ (1, 6, 4, 1) = 12-1 = 11
Roll seven: 4d6 ⇒ (6, 3, 3, 4) = 16-3 = 13
So that leaves 16,14,13,12,12,11, drop the 11 to an 8.