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1. Subject to paragraph 2 of this Part the conditions which must be fulfilled to allow the result of either test specified in paragraph 3 to be used as an alternative to the result of a migration test carried out under Part 3 are that—E+W+S
(a)the result obtained in a “comparison test” shows that the values are equal to or greater than those obtained in the test with simulant D; and
(b)the migration occurring in either test specified in paragraph 3 does not, after application of the appropriate reduction factor, exceed the appropriate migration limit.