Indicate by letter whether each of the events listed below increases (l), decreases (D), or has no effect (N) on an employer's periodic pension expense in the year the event occurs. _ Interest cost. Amortization of prior semca costAOCl Excess of the expected return on plan assets over the actual return. Expected return on plan assets. A plan amendment that increases benefits is made retroactive to prior years. Actuary's estimate of the PBO is increased. Cash contributions to the pension fund by the employer. Benefits are paid to retired employees. _ Semce cost. 10. Excess of the actual return on plan assets over the expected return. 11 Amortization of net lossAOCl_ 12. Amortization of net gainAOCl_