od -x b01.dwg > t01.txt
echo '' >> t01.txt
od -x b02.dwg >> t01.txt
echo '' >> t01.txt
od -x b03.dwg >> t01.txt
echo '' >> t01.txt
od -x b04.dwg >> t01.txt
echo '' >> t01.txt
od -x b05.dwg >> t01.txt
echo '' >> t01.txt
od -x b06.dwg >> t01.txt
