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##Joining around blocks
##around no label use join
##You can use the 'around' modifier before a block definition. In this case the new block will be sized and placed to contain the blocks listed. You can then use 'join' on these blocks too.##With the 'use' command you can define a set of attributes applying to all subsequent elements (until the next closing brace). 'arrows use' and 'blocks use' limit the impact to arrows and blocks, respectively.
use label="";
col x {box a, b, c, d;}
col y {box a, b, c, d;}
col z {box a, b, c, d;}
col v {box a, b, c, d;}
use line.radius=5, line.type=dotted;
around x.a+v.a box A1;
around z.a+z.c box A2 [imargin=10];
around x.c+x.d *oval A3;
join A1+A2+A3 [fill.color=lgray+50,
draw_before=x];
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