1.   He feels incredibly guilty over his occasional inability to endure.

2.   Lambaste their occasional inability to tell the difference between an incomplete pass and a fumble.

3.   Though he practiced the following two days, Barnum said he continued to experience a constant dull headache and an occasional inability to focus.

4.   Fiedler said Wu suffered from a split or cracked disk that caused pain, numbness, and an occasional inability to walk.