typedef char Chaine[21];

typedef struct Mot {
    Chaine mot;
    int occurence;
    struct Mot *fg, *fd;
} Mot, *ABR;


ABR NewNoeud(Chaine truc) {
    ABR tree = (ABR) malloc(sizeof(Mot));
    strcpy(tree->mot, truc);
    tree->fg = tree->fd = NULL;
    return tree;
}