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/usr/share/postgresql/10/extension/tsm_system_rows.control is in postgresql-10 10.6-0ubuntu0.18.04.1.

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# tsm_system_rows extension
comment = 'TABLESAMPLE method which accepts number of rows as a limit'
default_version = '1.0'
module_pathname = '$libdir/tsm_system_rows'
relocatable = true