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lisp-koans
Common Lisp Koans is a language learning exercise in the same vein as the ruby koans, python koans and others. It is a port of the prior koans with some modifications to highlight lisp-specific features. Structured as ordered groups of broken unit tests, the project guides the learner progressively through many Common Lisp language features.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
the koan is here https://github.com/google/lisp-koans/blob/master/koans-solved/scoring-project.lisp (a bit big to also paste here)
NOTE:
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Hence, a higher number means a more popular project.