this paragraph to each other’s Customs territories; c) exchange among themselves lists of Customs offices located along common frontiers, details of the power of such offices, their working hours and any changes in these particulars for the effective operation of the provisions of sub-paragraph (d) of this paragraph; d) consult each other on the establishment of common border posts and take such steps as may be deemed appropriate to ensure that goods exported or imported through common frontiers pass through the competent and recognised Customs office and along approved routes; e) endeavour to correlate the powers and harmonise the working hours for their corresponding Customs office referred to in sub-paragraph (c) of this paragraph; and f) maintain special surveillance over: (i) the entry into, sojourn in, and exit from their Customs territories of particular persons reasonably suspected by a Member State of being involved in activities that are contrary to the Customs Law of any Member State; (ii) the movement of particular goods suspected by any Member State to be the subject of illicit traffic towards the importing Member States; (iii) particular places where stocks of goods have been built up giving reason for suspicion that they may be used for illicit importation into any Member States; and (iv) particular vehicles, ships, aircraft, or other means of transport suspected of