Supply the missing structures A and B. 
Definitions:
Stock Variable
A quantity measured at a specific point in time, representing a snapshot of a certain economic variable such as capital or debt.
Periodic Variable
A variable that changes at regular intervals over time in a predictable pattern.
Dummy Variable
A numerical variable used in regression analysis to represent subgroups of the sample in your study.
Constant Variable
A variable that remains unchanged throughout the scope of an experiment or analysis.
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