Can one recipient delegate signing to two individuals?

I have 5 signers on my form. The last two signers (4 and 5) want it to go to one secretary first who will then delegate signing to each of them. Is this possible? How would I set it up? I know if I add the secretary as the 4th recipient, she can delegate to signer 4, but then how does signer 5 get the email? Can I put the secretary's email in twice as recipients 4 and 5?