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##Update block attributes
##update block attribute
##If you mention a block after its definition, you can change its attributes. Using the 'box', 'row', 'col', 'cell', '*<shape>' keywords actually define a block. If you just type a name without these you mention the block. If the block is not yet defined, it will be auto-defined if 'pedantic' is off, else it is an error.
a, b [color=red]; //a, b does not yet exist, create them
box a; //always defines a block. Now we have 2 blocks named 'a'
b, c [color=aqua]; //creates 'c', but not b. Only makes 'b' blue
box BIG {
use shape=oval; //make the default shape the oval
c->d; //'c' already exist (outside BIG), but 'BIG.d' is created oval
}
BIG.d [color=green]; //update the color of 'BIG.d'
BIG.e [color=red]; //error, we cannot create a block with a dot in name
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