#load.weight__loading__burden  weight to be borne or conveyed
  supertype:  #weight.artifact  an artifact that is heavy
  subtype:  #burthen  a variant of `burden'
  subtype:  #dead_load  a constant load on a structure (e.g. a bridge) due to the weight of the supported structure itself
  subtype:  #live_load__superload  a variable load on a structure (e.g. a bridge) such as moving traffic
  subtype:  #millstone.load  any load that is difficult to carry
  subtype:  #overload.load__overburden  an excessive burden
  subtype:  #overload  an electrical load that exceeds the available electrical power

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