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Update free-programming-playgrounds.md (#4677)

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If-Then-andSometimesElse %!s(int64=5) %!d(string=hai) anos
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@@ -194,6 +194,7 @@
 ### Ruby
 
 * [Codepad](http://codepad.org)
+* [Sololearn](https://code.sololearn.com/#rb)
 * [TryRuby](https://try.ruby-lang.org)