Yes, this puzzle is unusual. A typical puzzle like this has only one solution. And this puzzle has eight solutions.
I do not know can we solve it without a computer.
Please show your solution by picture - I have not yet installed Prime 6 for myself.
My solution in attach.
PS
From my book 2^5 Problems for STEM Education
"Rebus USA + USSR = PEACE is obsolete. First, there is no such country as the USSR anymore, and second, the solution of this puzzle is described in many entertaining books and even appears on the Internet—it is only necessary to enter (USA + USSR = PEACE) in any search engine.
More recently, and still unsolved, we can consider the problem† USA + IRAN = PEACE. This is unresolved in both the direct and figurative senses. In the figurative sense: taking into account the current state of US-Iranian relations."
