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#pragma once
struct list_item {
int value;
struct list_item *next;
};
/* Put x at the end of the list. */
void append(struct list_item *first, int x);
/* Put x at the beginning of the list. */
void prepend(struct list_item *first, int x);
/* Print att elements in the list. */
void print(struct list_item *first);
/* Find the first element in the list larger than x and input x right before
* that element. */
void input_sorted(struct list_item *first, int x);
/* Free everything dynamically located. */
void clear(struct list_item *first);
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