Dispatch one out of two e-mails found to perform an A/B test

I have this scenario that allows me to send emails in a tool called DATANANAS from addresses found on the internet.

The thing I can’t get right is that I want to dispatch at some point in the scenario, for example right after the email address is verified by CaptainVerify.

I want every second email to be sent in either an A sequence or a B sequence.

We’ll say that email 1 found should be sent in sequence A (all odd ones to summarize) and that the “even” emails should be sent in sequence B.

But how to do this disptach in MAKE? With conditions? Smaller than ? Every other time? I’m really stuck…

Thanks for your help