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4. If any person whose freedom of movement has been restricted by virtue of such a provision as is referred to in subsection (3) (a) of this section so requests at any time during the period of that restriction not earlier than two months after the restriction was imposed or two months after he last made such a request, as the case may be, his case shall be reviewed by an independent and impartial tribunal consisting of a president who shall be a legal practitioner of not less than seven years standing appointed by the Chief Justice and two other members appointed by the Governor- General acting in his discretion.