Drawback restriction: cotton yarn excluded from drawback eligibility by adding textile yarn headings to exclusion list. Amendment expands the drawback exclusion by substituting 'falling within heading 1006 or 2523' with 'falling within heading 1006, 2523, 5205, 5206 or 5207' in rule 3(1) second proviso clause (v), rule 6(4) and rule 7(5), thereby excluding cotton yarn classified under the added headings from drawback.