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Notwithstanding anything contained in section 21, where it is not reasonably practicable without inconvenience or delay to administer an oath to any person in the manner appropriate to his religious belief, such person shall be permitted and may be required to make his solemn affirmation instead of taking an oath and all the provisions of section 21 relating to solemn affirmations made by persons under that section shall apply to such affirmations made under this section.