Rules for next-to relation
The following rules implement a next-to relation that finds adjacent elements of a list:
(rule (?x next-to ?y in (?x ?y . ?u))) (rule (?x next-to ?y in (?v . ?z)) (?x next-to ?y in ?z))
What will the response be to the following queries?
(?x next-to ?y in (1 (2 3) 4)) (?x next-to 1 in (2 1 3 1))
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