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During the execution of the indicated command, an attempt was made to raise a non-positive number to a fractional power, e.g.  (-3)**2.5.  The result has been set to the system-missing value.

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During the execution of the indicated command, an attempt was made to raise a non-positive number to a fractional power, e.g.  (-3)**2.5.  The result has been set to the system-missing value.
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