1digraph {
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}