00270nam a2200109 a 450000500170000002000150001708200190003210000220005124500420007326000250011530000200014020251203091524.0  a8185198292  a6001.535,bnil  aNilsson, Nils, J.  aPrinciples of artificial intelligence  aDelhi: Narosa.c1990  ax,476p.c22 cm.