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[2 4 6 8] % even more syntactic sugar
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Those data structures are values (constant), [[first-class object|first class]] and [[dynamic typing|dynamically type checked]]. Variable names in Oz start with an uppercase letter to distinguish them from [[Literal (computer programming)|literals]]<ref>{{Cite web|url=https://mozart.github.io/mozart-v1/doc-1.4.0/tutorial/node3.html#label18|title=3 Basics}}</ref> which always begin with a lowercase letter.
===Functions===
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But Oz also provides a facility in case a function must not return values. Such functions are called procedures.<ref>{{Cite web|url=https://mozart.github.io/mozart-v1/doc-1.4.0/tutorial/node5.html#control.procedure|title = 5 Basic Control Structures}}</ref> Procedures are defined using the construct "proc" as follows
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