riso.belief_nets.BeliefNetwork combine-reports
{
	riso.belief_nets.Variable world-summary
	{
		type discrete { "is-not-present" "is-present" }
		parents
		{
			208.215.21.18/portland-report.elvis-is-here
			heaventemple.mit.edu/cambridge-report.elvis-is-here
			www.cdsoft.de/lampertheim-report.elvis-is-here
			phoenix.ef.boun.edu.tr/istanbul-report.elvis-is-here
		}
		distribution riso.distributions.ExactlyOne { }
	}

}