Editorial: The government should not fund any part of its health services with lottery revenue.
Conclusion (should)
The government should not fund any part of its health services with lottery revenue.
Evidence
The health services are essential to the community.
Lottery revenue could decline in the future and leave the government scrambling to cover a shortfall.
Evaluate
When we're prephrasing a principle to match our argument, we're basically thinking "If Premise, then Conclusion."
It should be a principle that would apply to how the government funds its health services. It should direct us to not fund health services with lotto revenue.
The concern from the Premise is that lotto revenue is unstable whereas health services are essential. Synthesizing those two ideas would sound like
Goal
Look for a rule talking about what we know about lotto revenue (could decline at some time in the future, causing a budget shortfall), what we know about health services (they're essential), and pointing us in the direction that those two things shouldn't go together.