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tree-link
tree <- link: link
Link used to create connections between parent- and son-nodes. Its attributes may be changed to attach arrows or modify one of the line attributes. For example, 
send(Tree?link, arrows, first).

will attach an arrow pointing to the root to every relation created after this call has been made.

See also
- tree-link_gap
- tree-parent_handle
- tree-son_handle
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