#musca_volitans__muscae_volitantes__floater__spot  spots before the eyes caused by opaque cell fragments in the vitreous humor and lens
  supertype:  symptom  (medical) any sensation or change in bodily function that is experienced by a patient and is associated with a particular disease
     supertype:  evidence.situation__grounds  your basis for belief or disbelief; knowledge on which to base belief; "the evidence that smoking causes lung cancer is very compelling"
        supertype:  situation_playing_some_role  e.g., a causal situation
           supertype:  situation  something that "occurs" in a real/imaginary region of time and space
              supertype:  thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type
           supertype:  thing_playing_some_role  category to classify things according to roles/viewpoints; classification under this category is application-dependant
              supertype:  thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type

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