#easiness__ease__simplicity  freedom from difficulty or hardship or effort: "he rose through the ranks with apparent ease"; "they put it into containers for ease of transportation"
  exclusion:  #difficultness
  supertype:  #quality  an essential and distinguishing attribute of something or someone; "the quality of mercy is not strained"--Shakespeare
  subtype:  #effortlessness  the quality of requiring little effort; "such effortlessness is achieved only after hours of practice"
     subtype:  #facility.effortlessness__readiness__readines  a natural effortlessness; "they conversed with great facility"; "a happy readiness of conversation"--Jane Austen
     subtype:  #smoothness.effortlessness  the quality of being free from errors or interruptions

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