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Merge pull request #14 from HaoranHuang/develop

Reorganized code structure
Merge pull request #15 from HaoranHuang/develop

added Henry Engine
Merge pull request #16 from HaoranHuang/develop

fixed started time bug
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Delete Environment.java
Merge pull request #17 from HaoranHuang/develop

aa
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rename AAA to CreateGraph
not finished: find paths/flights
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updated finder
updated finder, need further work on combineResult()