non constat

from Bouvier's Law Dictionary, Revised 6th Ed (1856)
NON CONSTAT. It does not appear. These words are frequently used, 
particularly in argument; as, it was moved in arrest of judgment that the 
declaration was not good, because non constat whether A B was seventeen 
years of age when the action was commenced. Sw. pt. 4, SS 22, p. 331. 
    

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