With no explanation, label each line with "O", "product-software", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
gnuplot
+
BSD
or
gnuplot
+
GPL
.
gnuplot:product-software
+:product-software
BSD:product-software
or:O
gnuplot:product-software
+:product-software
GPL:product-software
.:O