\section*{Declaration}
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I hereby certify that this material, which I now submit for assessment on the
programme of study leading to the award of Doctor of Philosophy (PhD.) is entirely
my own work and has not been taken from the work of others save and to the extent
that such work has been cited and acknowledged within the text of my work.
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Signed: $\underline{\hspace{30 mm} }$ ID No.: 55156720
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James Decraene
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Date:\hspace{5 mm}$\underline{\hspace{30 mm} }$