retain the Quaternary as a formal chronostratigraphic unit
divition of “super unit combine—super unit—unit”
formal culture [= formal discipline]
Basic unit finance unit ideology political works
control unit(instruction)control unit
halogen sealed-beam unit (HSB unit)
identical unit or proportional unit of the body
Line unit and tributary unit
radio remote unit and base band unit
sealed in fuel unit encapsulated fuel unit
super_unit and super_unit pattern
time-rock unit =time-stratigraphic unit
x unit (=x-ray unit =siegbahn)
logical unit to logical unit
both spiritual and formal resemblance iconicity
algebraic formal pattern recognition
alternate return formal
arithmetization of formal system