Help please How to control 100 Relays with two MEGA 2560

Please help:

It is necessary to control the 100 Relay with two Arduino Mega 2560, the activation must be sequential of two Relay, for example, 1 with 100 and so on. The 7 modules of 16 relays each are already connected to the digital outputs of the Mega 2560.

Please, what should I do?

Thank you.

Javier B.

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