sule 6666. (1) Every registered person required to deduct tax at source under section 51 (hereafter in this rule referred to as deductor) shall furnish a return in FORM GSTR-7 4[, on or before the tenthRegulations under the PCT Rule 66 Procedure before the International Preliminary Examining Authority. 66.1 Basis of the International Preliminary Examination (a) Subject to paragraphs