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$   digraph G {
office1 [label="Building office1", shape=circle];
office2 [label="Building office2", shape=circle];
warehouse1 [label="Building warehouse1", shape=circle];
contract1 [label="Contract contract1", shape=diamond];
contract2 [label="Contract contract2", shape=diamond];
office1->office2 ;
warehouse1->contract1 ;
contract2->contract1 ;
}
0 --> 1 
1 --> 
2 --> 3 
3 --> 
4 --> 3 
Exit Code: 
0