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/**
* A singly linked list node node
*/
struct node {
int data;
struct node *next;
};
typedef struct node Node;
/**
* A queue
*/
typedef struct {
Node *head;
int size;
} Queue;
/**
* A stack
*/
typedef struct {
Queue *q1;
} Stack;
Stack *initialize(void);
void push(Stack *stack, int data);
int pop(Stack *stack);
int size(Stack *stack);
void destroy(Stack *stack);
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