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Detects if removing a link from the network, breaks up the network in separate subnets. The problematic links are marked with 1 in the IA array.
CulDeSac links are not marked, since testing for CulDeSac can easily be done with calling CulDeSac for all links.
Links with oneway restrictions are not marked, use SubNetEx instead.
The function returns the number of elements set in the array.
See also SubNetEx
Syntax: Bridges(var IA: TIntegerArray): integer