char *kth_word_in_mth_sentence_of_nth_paragraph(char ****document, int k, int m, int n) {
    return document[n - 1][m - 1][k - 1];
}

char **kth_sentence_in_mth_paragraph(char ****document, int k, int m) {
    return document[m - 1][k - 1];
}

char ***kth_paragraph(char ****document, int k) {
    return document[k - 1];
}

char **strsplit(char *text, const char *dilim, const int max, int *len) {
    char **arr = (char **)malloc(max * sizeof(char *));
    for (int i = 0; i < max; i++)
        arr[i] = (char *)malloc(MAX_CHARACTERS * sizeof(char));
    int count = 0;

    char *token = strtok(text, dilim);
    while (token != NULL) {
        strcpy(arr[count], token);
        arr[count] = (char *)realloc(arr[count], (strlen(arr[count]) + 1) * sizeof(char));
        count++;
        token = strtok(NULL, dilim);
    }

    if (count != max)
        arr = (char **)realloc(arr, count * sizeof(char *));

    *len = count;
    return arr;
}

char ****get_document(char *text) {
    int c_para;
    char **ps = strsplit(text, "\n", MAX_PARAGRAPHS, &c_para);
    char ****doc = (char ****)malloc(c_para * sizeof(char ***));
    for (int i = 0; i < c_para; i++) {
        int c_line;
        char **ls = strsplit(ps[i], ".", 100, &c_line);
        doc[i] = (char ***)malloc(c_line * sizeof(char **));
        for (int j = 0; j < c_line; j++) {
            int c_word;
            doc[i][j] = strsplit(ls[j], " ", 100, &c_word);
            free(ls[j]);
        }
        free(ps[i]);
        free(ls);
    }
    free(ps);

    return doc;
}