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Transactions T1 and T3 are performing initial reads on items A and D respectively. Since they have no R/W conflict among them, they can be ordered in 2 ways.

Transactions T2,T4  and T5 are performing final write on items C, E and B respectively in the said order.

T2 and  T4 do not have a R/W conflict among them. So they can be ordered in 2 ways.

Therefore, total orderings = 2*2*1 = 4.

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