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| sealed trait Term | |
| case class Const(name: String) extends Term | |
| case class Var(name: String) extends Term | |
| case class Atom(relation: String, terms: Term*) | |
| sealed trait Clause | |
| case class Rule(head: Atom, body: Atom*) extends Clause | |
| case class Fact(atom: Atom) extends Clause | |
| case class Query(name: String, atoms: Atom*) extends Clause |
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