*Vertices 2
1 "internal-combustion piston engines; combustion engines in general" 0.0 0.0 0.0  x_fact 0.000000 y_fact 0.000000
2 "air-conditioning; air-humidification; ventilation; use of air currents..." 0.0 0.0 0.0  x_fact 0.693147 y_fact 0.693147
*Matrix
1.000000 0.000000
0.000000 1.000000