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659. The roots that form

The roots that form their present-stem by reduplication are a very small class, especially in the modern language; they are only 50, all told, and of these only a third (16) are met with later. It is, however, very difficult to determine the precise limits of the class, because of the impossibility (referred to above, under subjunctive: 648) of always distinguishing its forms from those of other reduplicating conjugations and parts of conjugations.

a. Besides the irregularities in tense-inflection already pointed out, others may be noticed as follows.