
physical:difficulty,

differential:operator,

conceptual:difficulty,

evolutionary:event,

relevant:property,

evolutionary:change,

objective:function,

mathematical:difficulty,

dynamic:quantity,

primary:characteristic,

physical:characteristic,

mathematical:operator,

unexpected:difficulty,

diagnostic:quantity,

genetic:event,

physical:quantity,

global:property,
Category Nuances for null:

physical,

primary,

dynamic,

global,

mathematical,

conceptual,

objective,

genetic,

evolutionary,

differential,

relevant,

unexpected,

diagnostic,
Simple Categories for null: