... (3) Any country of the Union which has ceased to be regarded as a developing country as referred to in paragraph (1) shall no longer be entitled to renew its declaration as provided in paragraph (2), and, whether or not it formally withdraws its declaration, such country shall be precluded from availing itself of the faculties referred to in paragraph (1) from the expiration of the ten-yearperiod then running or from the expiration of a period of three years after it has ceased to be regarded as a developing country, whichever period expires later.
...
... (c) Any country which has made a declaration according to this paragraph may not subsequently avail itself of the faculty provided for in ArticleII even if it withdraws the said declaration. ...