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“...notification within the term of four months from the date of the present convention, and in case the existing treaty contains no clause permitting its modification or annulment, the Republic of Panama agrees to procure its modification or annulment in such form that there shall not exist any conflict with the stipulations of the present convention. Article XXI. The rights and privileges granted by the Republic of Panama to the United States in the preceding articles are understood to be free of all anterior debts, liens, trusts, or liabilities or concessions or privileges to other governments, corporations, syndicates or...”