Assume that objects a1, a2, and a3 are managed by a server, which provides two operations to operate the objects. read(a): returns the value of object a write(a, v): assigns the value v to object a Assume that the following two concurrent transactions T and U are performed on these objects. T: read(a2); read(a1); write(a2, a2-25); read(a3); write(a1, a1+52) U: read(a3); read(a2); write(a2, a2+33); write(a3, a3-26) Assume that the original values of a1, a2, and a3 are 111, 106 and 125 respectively. Answer the following questions based on the above scenario.

Question:

If there is no concurrency control, transactions T and U may perform the following interleaving operations on objects a1, a2 and a3. What problem can be caused by the operations? Justify your answer.