whether any of the substances possess addicting properties is very difficult to determine on animals, although efforts are being made to study this aspect of the problem on dogs and monkeys.

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We show that in every non low \ce degree, there are sets with semilow_(1.5) complements without semilow complements as well as sets with semilow₂ complements and the outer splitting property that do not have semilow_(1.5) complements.

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