{Test {DeleteAll 3 nil} '=' nil} {Test {DeleteAll 1 [1 2 3 2 1 2 3 2 1]} '=' [2 3 2 2 3 2]} {Test {DeleteAll 4 [1 2 3 2 1 2 3 2 1]} '=' [1 2 3 2 1 2 3 2 1]} {Test {DeleteAll 3 [1 2 3]} '=' [1 2]}