> ? [some #physical_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]
];

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