digraph "Hash Tables"
{
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  node [fontname="Helvetica",fontsize="10",shape=box];
  rankdir=LR;
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  Node1 [label="Hash Tables",height=0.2,width=0.4,color="black", fillcolor="grey75", style="filled", fontcolor="black",tooltip=" "];
  Node2->Node1 [shape=plaintext, dir="back", style="solid"];
}