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Those pleas are principally based on infringement of Article 1 of Common Position 2001/931, it being noted that that common position constitutes the relevant text in the present case, including for the examination of the contested implementing regulations which are formally based solely on Regulation No 2580/2001, since that regulation is intended to implement the measure freezing the funds of terrorists and terrorist entities within the Member States on the basis of the principles and definitions of terrorist acts contained in the common position and on the basis of the lists drawn up by the Council under that common position. Article 1 of that common position provides, in paragraphs 3, 4 and 6: ‘3. For the purposes of this Common Position, “terrorist act” shall mean one of the following intentional acts, which, given its nature or its context, may seriously damage a country or an international organisation, as defined as an offence under national law, where committed with the aim of: (i) seriously intimidating a population, or (ii) unduly compelling a Government or an international organisation to perform or abstain from performing any act, or (iii) seriously destabilising or destroying the fundamental political, constitutional, economic or social structures of a country or an international organisation: (a) attacks upon a person’s life which may cause death; (b) attacks upon the physical integrity of a person; (c) kidnapping or hostage taking; (d) causing extensive destruction to a Government or public facility, a transport system, an infrastructure facility, including an information system, a fixed platform located on the continental shelf, a public place or private property, likely to endanger human life or result in major economic loss; (e) seizure of aircraft, ships or other means of public or goods transport; (f) manufacture, possession, acquisition, transport, supply or use of weapons, explosives or of nuclear, biological or chemical weapons, as well as research into, and development of, biological and chemical weapons; (g) release of dangerous substances, or causing fires, explosions or floods the effect of which is to endanger human life; (h) interfering with or disrupting the supply of water, power or any other fundamental natural resource, the effect of which is to endanger human life; (i) threatening to commit any of the acts listed under (a) to (h); (j) directing a terrorist group; (k) participating in the activities of a terrorist group, including by supplying information or material resources, or by funding its activities in any way, with knowledge of the fact that such participation will contribute to the criminal activities of the group. For the purposes of this paragraph, “terrorist group” shall mean a structured group of more than two persons, established over a period of time and acting in concert to commit terrorist acts. “Structured group” means a group that is not randomly formed for the immediate commission of a terrorist act and that does not need to have formally defined roles for its members, continuity of its membership or a developed structure. 4. The list in the Annex shall be drawn up on the basis of precise information or material in the relevant file which indicates that a decision has been taken by a competent authority in respect of the persons, groups and entities concerned, irrespective of whether it concerns the instigation of investigations or prosecution for a terrorist act, an attempt to perpetrate, participate in or facilitate such an act based on serious and credible evidence or clues, or condemnation for such deeds. Persons, groups and entities identified by the Security Council of the United Nations as being related to terrorism and against whom it has ordered sanctions may be included in the list. For the purposes of this paragraph “competent authority” shall mean a judicial authority, or, where judicial authorities have no competence in the area covered by this paragraph, an equivalent competent authority in that area. … 6. The names of persons and entities on the list in the Annex shall be reviewed at regular intervals and at least once every six months to ensure that there are grounds for keeping them on the list.’