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8. (50 pts) Managing Free Memory with Linked List : write a first fit program to manage free memory using linked list as in Figure 3-6(c) Then test your program using the following memory use pattern by printing out the linked list after each memory use or free event: there are in total 10 memory units, and the memory's use pattern is as follows: A (use 2 units) B (use 3 units). C (use 4 units), D (free 3 units of B). E (use 1 unit), F (free 4 units of C), G (free 2 units of A) and H (use 5 units)