The compare$\_$and$\_$swap$()$ instruction can be used to design lock$-$free data structures such as stacks, queues, and lists. The program example shown in Figure $6\mathrm{.}18$ presents a possible solution to a lock$-$free stack using CAS instructions, where the stack is represented as a linked list of Node elements with top representing the top of the stack. Is this implementation free from race conditions?