katso esim Salo 1996 http://www.uwasa.fi/stes/step96/step96/salo/gao4.html#Risteytysoperaatiot
e.g.:
OffSpring: 1100, 0011
PythonNotebook? --antont, Mon, 27 Jun 2005 12:14:00 +0300 reply
this would be a great example page! .. as the requirements state that from a notebook also the actual production code for use must be able to be extracted