Gateways
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I have written the code of a more intelligent trader. One of the
predicates in it is gateway(Region,Square)
.
This is true if Square is
a gateway to Region; that is, if Square is inside Region, but also
connects to a square that is outside it. What is wrong with the
definition below?
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Up: Traveller
Previous: Some arithmetic
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Jocelyn Paine
Tue Jun 4 18:14:46 BST 1996