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Arcs in the Schematic technology may be negated,
which causes them to have a bubble drawn where they attach to schematic elements.
This property can be changed with the Toggle Port Negation command
(in menu Edit / Technology Specific).
It may also be controlled by the Object Properties... dialog
(in menu Edit / Properties).
Note that you can toggle negation when an arc is selected
(which leaves the system to guess which end you want to negate)
or you can toggle negation when a node and port is selected
(in which case, the arc attached to that port is negated).
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