Consider the following actions taken by transaction T$1$ on database objects

X and Y:

R$($X$),$ W$($X$),$ R$($Y$),$ W$($Y$)$

$1.$ Give an example of another transaction T$2$ that, if run concurrently to transaction T without some form of concurrency control, could interfere with T$1.$

$2.$ Explain how the use of Repeatable Read Isolation Level would prevent interference between the two transactions.