In a similar way, the computation of the pairwise temporal keys is written:
PRF-512(PMK, "Pairwise key expansion", MAC1||MAC2||Nonce1||Nonce2)
Here MAC1 and MAC2 are the MAC addresses of the two devices where MAC1 is the smaller (numerically) and MAC2 is the larger of the two addresses. Similarly, Nonce1 is the smallest value between ANonce and SNonce, while Nonce2 is the largest of the two values.