[SOLUTION] Inference Engine (#37)

[Daniel Sheppard]

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My solution is here:

http://members.iinet.net.au/~soxbox/inference.rb

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[Paolo Capriotti]

My solution is here:
=20
http://members.iinet.net.au/~soxbox/inference.rb

There are some problems:

all dogs are mammals OK.
all mammals are animals OK.
some animals are not mammals

Sorry, that contradicts what I already know.