How many of the five pairs of items listed below are exact duplicates?

Name: How many of the five pairs of items listed below are exact duplicates?
Brand: Quizplus
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Question

Quizplus · Accepted Answer

There are two pairs of duplicates:
Johnson, B.  =  Johnson, B.
Holland, Z.C. =  Holland, Z.C.
These pairs are not exact duplicates:
Warren, RM. ≠ Warren, R.M.
O'Shea, D.Y. ≠ O'Shay, D.Y.
Bennett, J.D. ≠ Bennet, J.D.

How Many of the Five Pairs of Items Listed Below