signal@@1	signal	transmission	4
signal@@1	signal	indicator	3
signal@@1	signal	broadcast	2
signal@@1	signal	broadcast signal	2
signal@@1	signal	frequency signal	2
signal@@1	signal	reception	2
signal@@2	signal	alert	6
signal@@2	signal	beacon	5
signal@@2	signal	alarm	4
signal@@2	signal	flare	3
signal@@2	signal	warning	3
signal@@3	signal	sign	7
signal@@3	signal	alert	3
signal@@3	signal	indicator	3
signal@@3	signal	indication	2
signal@@3	signal	warning	2