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неписаный закон stresses
gen.	consuetude; prescription; unwritten law; oral law; unwritten rule (Rust71); secretive rules (pothead2104)
dipl.	imprescriptible law; unwritten code
fig.	law of the land (A.Rezvov)
Makarov.	imperscriptible law
rel., jud.	Halakha; Halakhah; oral law (В.И.Макаров); Oral Torah (В.И.Макаров)
relig.	lex non scripta (Latin for "unwritten law")