040000 tree 6653f33a4ced66e89e5952549b65129240c8cd07	GroupByKey
100644 blob 5de9eb69f8191156449db8ed61d217b55a00cfc5	lesson-info.yaml
100644 blob 6401fb6f65782ea941f4ababf816e3f0db22a55c	lesson-remote-info.yaml