<bigaf>
398                 0                   0                   128                 256                 0                   7                   256                 0                   1641404036  550591      1000499     644         6   oddlen`
oddlen
19                  398                 128                 1641404036  550591      1000499     644         7   evenlen`
content_of_evenlen
75                  0                   256                 0           0           0           0           0   `
2                   128                 256                 oddlenevenlen