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To release heap memories in a linked list without causing a memory leak, you need to follow the below steps:

1. Traverse the linked list and free the memory of each node using the free() function.

2. Set the pointer of each node to NULL after freeing the memory to avoid accessing a dangling pointer.

3. Set the head pointer of the linked list to NULL to indicate that the linked list is empty.

By following these steps, you can release the heap memories of a linked list without causing a memory leak.