03年的影楼照片，还是67# PhotoGear - 摄影器材
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Given a social graph, find if there is a path between two persons with at
most 2 steps (3rd level connection), how to handle it in distributed way (
large graph stored at a large number of nodes, minimize cross-communication)
most 2 steps (3rd level connection), how to handle it in distributed way (
large graph stored at a large number of nodes, minimize cross-communication)
