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      1 digraph {
      2 	compound=true
      3 	fontname="Inconsolata, Consolas"
      4 	fontsize=10
      5 	margin="0,0"
      6 	ranksep=0.2
      7 	penwidth=0.5
      8 
      9 	node [fontname="Inconsolata, Consolas", fontsize=10, penwidth=0.5]
     10 	edge [fontname="Inconsolata, Consolas", fontsize=10, arrowhead=normal]
     11 
     12 	subgraph cluster1 {
     13 		margin="10,10"
     14 		labeljust="left"
     15 		label = "Before"
     16 		style=filled
     17 		fillcolor=gray95
     18 
     19 		node [shape=Mrecord, style=filled, colorscheme=spectral7]
     20 
     21 		{
     22 			rank = same
     23 			b1 [label="{b:number|456}", fillcolor=6]
     24 			a1 [label="{a:number|123}", fillcolor=6]
     25 		}
     26 
     27 		a1 -> b1 [style="dashed", label="Move", dir=back]
     28 	}
     29 
     30 	subgraph cluster2 {
     31 		margin="10,10"
     32 		labeljust="left"
     33 		label = "After"
     34 		style=filled
     35 		fillcolor=gray95
     36 
     37 		node [shape=Mrecord, style=filled, colorscheme=spectral7]
     38 
     39 		{
     40 			rank = same
     41 			b2 [label="{b:null|}", fillcolor=1]
     42 			a2 [label="{a:number|456}", fillcolor=6]
     43 		}
     44 		a2 -> b2 [style=invis, dir=back]
     45 	}
     46 	b1 -> b2 [style=invis]
     47 }