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public ssize_t            get_length         ();
public uchar              get_days_in_month  (DateYear year);
public bool               valid              ();
public bool               valid              ();
public static pointer     malloc             (ulong n_bytes);
public static pointer     malloc0            (ulong n_bytes);
public static pointer     realloc            (pointer mem,
                                           ulong   n_bytes);
protected static pointer  myarse             ();