Question

In a social network, online communities refer to the group of people with an interest towards tha same topic.People connect with each other in a social network.A connection between person I and J
is represented as C I J. When two persons belonging to different communities connect,the net effect is merger of both communities with I and J belonged to.
We are only interested in finding out the communities with the member count being an even number.your task is to find out those communities.