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No arguments accepted.
The all composite arcs in the active window are scanned. (Composite arcs are collections of arcs represented by a single line between two "Collapsed" nodes.) If the number of contributors to a composite arc is greater than or equal to the high threshold (see rcl_set_high_thresholds), the destination and source nodes of the composite arc are selected. Arc type filtering is ignored by this procedure (see rcl_filter_arctype). The rcl_select_invert can be used with this command to select all those nodes that have no strong connections. See also rcl_select_weak_connect.
The number of nodes selected is returned.
# Set the threshold to 20 or more contributors and select the
# strongly connected nodes.
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