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  5. That Mars is inhabited by beings of some sort or other we...

That Mars is inhabited by beings of some sort or other we may consider as certain as it is uncertain what these beings may be.

Percival Lowell
Nature, Space, Mars
"Fantastically Wrong: One Astronomer’s Quest to Expose the Alien-Built Canals of Mars" by Matt Simon, www.wired.com. May 21, 2014.
That Mars is inhabited by beings of some sort or other we may consider as certain as it is uncertain what these beings may be.