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----connected components---------------
- d: []
- a: []
  b: []

----connected components---------------
- d: [e]
- a: [c]
  b: [c]

#This program read the triplets from file named "data" into
#an array of array.
#use strict;
...
}
print "----connected components------------";
use YAML; print Dump \@allgraphs;