' all lines (meaning connector and borders, there are no other lines in WBS) are black by default
' Note that connector are actually "arrows" even if they don't look like arrows
' This is to be consistent with other UML diagrams. Not 100% sure that it's a good idea
' So now connectors are green at this level
' will target the "root" (first level) node,
' AND root level elements like Arrows (styled by Line styles)
' Note how it will override the
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