central office+◼◼◼noun
head office+◼◼◻noun[UK: ˈhed.ˈɒ.fɪs] [US: ˈhed.ˈɒ.fɪs]
main office+◼◼◼noun[UK: meɪn ˈɒf.ɪs] [US: ˈmeɪn ˈɑːf.əs]
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