39Thus, the fact that the conditions required for a duplication of proceedings and penalties of a criminal nature derive not only from legislative provisions but also from their interpretation by national courts is not, in itself, such as to call into question the clear and precise nature of the national legislation, provided, however, that the individual is in a position to ascertain from the wording of the relevant provision and, if need be, with the assistance of the courts’ interpretation of it, which acts and omissions may give rise to such a duplication of proceedings and penalties.
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