Ou·spen·sky 
(-spĕnskē, -spyĕnskyē), Peter Demianovich 1878-1947.
(-spĕnskē, -spyĕnskyē), Peter Demianovich 1878-1947. Russian mystic who gained international fame with his book Tertium Organum: A Key to the Enigmas of the World (1912).
- constraint
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