PHNOM PENH, Aug. 3 (Xinhua) -- Six more countries signed the instrument of accession to the Treaty of Amity and Cooperation in Southeast Asia (TAC) here on Wednesday, bringing the number of state parties to the treaty of ASEAN to 49. Representatives from Denmark, Greece, the Netherlands, Oman, Qatar and the United Arab Emirates inked the instrument of accession to the treaty on the sidelines of the 55th ASEAN Fo