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Each row in the TE dataset may be thought of as representing a "unique element" in the same sense of "unique" as a CRF template page for a collecting certain type of data referred to as "unique page." For instance, a CRF might be described as containing 87 pages, but only 23 unique pages. By analogy, the trial design matrix in Example Trial 1 (see Section 6.5.1.1 Trial Arms) has below has 12 study cells, each of which contains 1 element, but the same trial design matrix contains only 5 unique elements, so the TE dataset for that trial has only 6 records.

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