Saved Nuts<br>The pine cone fell to the ground. A squirrel gathered the nuts. It hid them away for the winter. Another squirrel noticed the nuts. He took the saved nuts.
The nuts were acorns.
The story says "a pine cone fell to the ground" and that a squirrel gathered the nuts. They must have been pine nuts. I think the system was confused because it can't make connections from context like that. 
( z1 nuts :domain ( z2 acorn ) )