doc/tutorial/basics: add basics tutorial
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+[TOC](Readme.md) [Prev](commas.md) [Next](curly.md)
+
+# Commas are Still Required in Lists
+
+
+Commas are still required as separators in lists.
+The last element of a list may also have a comma.
+
+<!-- CUE editor -->
+```
+[
+ 1,
+ 2,
+ 3,
+]
+```
+
+<!-- JSON result -->
+```json
+[
+ 1,
+ 2,
+ 3
+]
+```
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