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<!DOCTYPE html>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta http-equiv="Content-Language" content="en-us">
<title>Example Web Editor</title>
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<h1>Example Problem Web Editor</h1>
</div>
<div class="content">
<div class="xtext-editor"
data-editor-xtext-lang="problem"
data-editor-enable-formatting-action="true"
data-editor-send-full-text="false"
><pre>class Family
contains Person[0..*] members.
class Person
refers Person[0..*] children opposite parent,
refers Person[0..1] parent opposite children.
error loop(Person p) := children+(p, p).
error multipleRoots(Person p, Person q) :=
!equals(p, q), !parent(p, _), !parent(q, _).
Family(family).
members(family, anne).
members(family, bob).
members(family, ciri).
children(anne, ciri).
?children(bob, ciri).
scope Family = 1, Person += 5..10.</pre></div>
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