u_char even_parity[] = {
    0,  1,  1,  0,  1,  0,  0,  1,  1,  0,  0,  1,  0,  1,  1,  0, 
    1,  0,  0,  1,  0,  1,  1,  0,  0,  1,  1,  0,  1,  0,  0,  1, 
    1,  0,  0,  1,  0,  1,  1,  0,  0,  1,  1,  0,  1,  0,  0,  1, 
    0,  1,  1,  0,  1,  0,  0,  1,  1,  0,  0,  1,  0,  1,  1,  0, 
    1,  0,  0,  1,  0,  1,  1,  0,  0,  1,  1,  0,  1,  0,  0,  1, 
    0,  1,  1,  0,  1,  0,  0,  1,  1,  0,  0,  1,  0,  1,  1,  0, 
    0,  1,  1,  0,  1,  0,  0,  1,  1,  0,  0,  1,  0,  1,  1,  0, 
    1,  0,  0,  1,  0,  1,  1,  0,  0,  1,  1,  0,  1,  0,  0,  1, 
   };