Beginning with the data base and the rules you formulated in exercise 4.63
, devise a rule for adding ''
to a grandson relationship. This should enable the system to deduce that Irad is the great-grandson of Adam, or that Jabal and Jubal are the great-great-great-great-great-grandsons of Adam. (Hint: Represent the fact about Irad, for example, as
((great grandson) Adam Irad)
. Write rules that determine if a list ends in the word grandson. Use this to express a rule that allows one to derive the relationship
((great . ?rel) ?x ?y)
is a list ending in grandson.) Check your rules on queries such as
((great grandson) ?g ?ggs)
(?relationship Adam Irad)
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