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The fair value of our pension plan assets by investment category and the corresponding level within the fair value hierarchy were as follows: 

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(a) No single equity holding amounted to more than 1% of the total fair value. (b) Our corporate bond investments had an average rating of A-. 

(c) 

Investments measured at fair value using NAV as a practical expedient are not classified in the fair value hierarchy. The fair value amounts presented in this table for these investments are included to permit reconciliation of the fair value hierarchy to the total plan assets. 

