| http://www.w3.org/ns/prov#value | - graph (a) of subsection (1) or, as the case may be, in paragraph (a) of subsection (1) or (1A) above], the undertaking shall have the effect of relieving the first-mentioned person from the duty imposed [F16by virtue of that paragraph] to such extent as is reasonable having regard to the terms of the undertaking.
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