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+NAME
+    FS::dbdef_colgroup - Column group objects
+
+SYNOPSIS
+      use FS::dbdef_colgroup;
+
+      $colgroup = new FS::dbdef_colgroup ( $lol );
+      $colgroup = new FS::dbdef_colgroup (
+        [
+          [ 'single_column' ],
+          [ 'multiple_columns', 'another_column', ],
+        ]
+      );
+
+      @sql_lists = $colgroup->sql_list;
+
+      @singles = $colgroup->singles;
+
+DESCRIPTION
+    FS::dbdef_colgroup objects represent sets of sets of columns.
+
+METHODS
+    new Creates a new FS::dbdef_colgroup object.
+
+    sql_list
+        Returns a flat list of comma-separated values, for SQL
+        statements.
+
+    singles
+        Returns a flat list of all single item lists.
+
+BUGS
+SEE ALSO
+    the FS::dbdef_table manpage, the FS::dbdef_unique manpage, the
+    FS::dbdef_index manpage, the FS::dbdef_column manpage, the
+    FS::dbdef manpage, the perldsc manpage
+
+HISTORY
+    class for dealing with groups of groups of columns (used as a
+    base class by FS::dbdef_{unique,index} )
+
+    ivan@sisd.com 98-apr-19
+
+    added singles, fixed sql_list to skip empty lists ivan@sisd.com
+    98-jun-2
+
+    untaint things we're returning in sub singels ivan@sisd.com 98-
+    jun-4
+
+    pod ivan@sisd.com 98-sep-24
+