1. "We should set up a password (XXX) we can say to each other so we know it's us." I don't understand the XXX part. It does sound like 'who' to me, but I don't think it is proper.
2. "I'm gonna(?) (XXX) that next year myself." Same here. The XXX part sounds like 'with', but I'm not sure.
Top answer
1. We should set up a password. Then we can say it to each other so we know it’s us.
— RandomGuy
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