Exactly: one option is a single-time, fixed cost (single-time-ever if you write it as: CN_LCR_BiaoMei = 77, // either mother's sibling's daughter or father

Exactly: one option is a single-time, fixed cost (single-time-ever if you write it as: CN_LCR_BiaoMei = 77, // either mother's sibling's daughter or father's sister's daughter // aka female cousin involving at least one female parent ), while the other adds a constant tax on all uses of the variable (well, constant in this case) in perpetuity.