> ? [some #natural_phenomenon] [pm#graph1_on_work.energy [any #work.energy, may have for pm#energy_measure: several #work_unit] ]; [pm#graph1_on_electromagnetism [any #electromagnetism, may have for pm#force_measure: several #electromagnetic_unit] ]; [pm#graph1_on_radiation [any #radiation, may have for pm#radiation_measure: several #radioactivity_unit] ]; //Search time: 0.00055 s, printing time: 0.0007 s (according to the Unix function gettimeofday())