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submaster key
submaster key n. 
/ˌsʌbˈmɑːstə kiː/, /ˈsʌbmastə kiː/, /ˌsʌbˈmastə kiː/, /ˌsəbˈmæstər ˌki/
Brit. /ˈsʌbmɑːstə kiː/
, /ˈsʌbmɑːstə kiː//ˌsʌbˈmɑːstə kiː//ˈsʌbmastə kiː//ˌsʌbˈmastə kiː/U.S. /ˈsəbˌmæstər ˌki/
, /ˈsəbˌmæstər ˌki//ˌsəbˈmæstər ˌki/ΚΠ
1820 New Monthly Mag. Dec. 684/1 Key, sub-master key, and grand-master key.
1916 Archit. & Building June 108/1 Each department has a sub master key which operates all the locks in that department.
2001 M. A. Wanko Safe Schools vi. 106 Develop a system of grandmaster, master, and submaster keys.
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as lemmas
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