If a bill of exchange is drawn in a set of three, 

Section 91 - Evidence of terms of contracts, grants and other dispositions of property reduced to form of document. When the terms of a contract, or of a grant, or of any other disposition of property, have been reduced to the form of a document, and in all cases in which any matter is required by law to be reduced to the form of a document, no evidence shall be given in proof of the terms of such contract, grant or other disposition of property, or of such matter, except the document itself, or secondary evidence of its contents in cases in which secondary evidence is admissible under the provisions hereinbefore contained. Where there are more originals than one, one original only needs be proved.