1.If the litigants fail to agree on the instruments valid for comparison, only the following shall be admissible: a.Handwriting, signature, signature stamp or fingerprint affixed to formal instruments; b.Part of the instrument under investigation whose accuracy is admitted by the opposing party; c.The litigant's handwriting or signature written by him or fingerprint affixed by him before the court; and d.Handwriting, signature, signature stamp or fingerprint affixed to ordinary instruments proved to be attributed to the litigant. 2.Denied handwriting, signature, signature stamp or fingerprint shall be compared to the handwriting, signature, signature stamp or fingerprint proved to be attributed to the party against whom the instrument under investigation is provided as evidence.
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