function adjMat = backedges(n, assym)

valvec = getValvec(n);
assymv = assym*valvec;

adj0 = [zeros(size(assym,1),1), assym(:,1:end-1)];
adj0v = adj0*valvec;

adj1 = [ones(size(assym,1),1), assym(:,1:end-1)];
adj1v = adj1*valvec;

%[assymv,adj0v,adj1v]

adjMat = -ones(size(assym,1),2);
for i=1:length(assymv),
	x = find(assymv==adj0v(i));
	if (length(x>0)),
		adjMat(i,1) = x;
	end
	x = find(assymv==adj1v(i));
	if (length(x>0)),
		adjMat(i,2) = x;
	end
end