100644 blob fa10c99797a48bae5bfc4b81e00b51b1d763e774	EmptyGraph.java
100644 blob 4450ea0e2951d8b0bfbb574b0abe52722a6b49ac	EmptyProperty.java
100644 blob a77fd6fc03bcf53e4478f016139a6f7dca7d9c92	EmptyVertexProperty.java