T1 T2 T3 Bal x Bal _y Sum begin_tran Sum = 0 read(Bal_x) Sum = Sum + Bal_x t1 150 75 t2 begin_tran read(Bal_x) Bal_x = Bal_x - 25 150 75 begin_tran read(Bal_y) Bal_y = Bal_y + t3 150 75 t4 150 75 150 %3D write(Bal_x) t6 commit read(Bal_y) Sum = Sum + Bal y t5 20 125 75 150 write(Bal_y) 125 95 225 %3D t7 commit commit 125 95 225

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