Blockdiag

[plot blockdiag]blockdiag {  default_node_color = lightyellow;  default_group_color = lightgreen;  default_linecolor = magenta;  default_textcolor = red;  A -> B -> C;       B -> D;  group {    C; D;  }}[/plot]

1. [plot blockdiag]blockdiag {  default_node_color = lightyellow;  default_group_color = lightgreen;  default_linecolor = magenta;  default_textcolor = red;  A -> B -> C;       B -> D;  group {    C; D;  }}[/plot]

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