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Amendment of section 47 of Principal Act. 
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4.—Section 47 of the Principal Act is hereby amended by the insertion— 
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(a) in subsection (2)(a)(ii), after “land” of “or any substratum of land”, and 
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(b) in subsection (2)(c)— 
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(i) after “The land” of “or substratum of land”, and 
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(ii) after “all land” in both places where it occurs of “, substrata of land”. 
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