anchor.diff:    });
     
     // The table of groups to be graders on the left.
  -  var GroupsGraderTable = React.createClass({
  +  var ReviewerTable = React.createClass({
       getDefaultProps: function() {
         return {
           columns: [
  
positive.code:             {skip_empty_submissions}
            </div>
            <div className='columns'>
              <GroupsGraderTable ref="groupsTable"
                groups={this.state.reviewer_groups}
                selected_groups={this.state.selected_groups}
                onSelectedGroupsChange={this.updateSelectedGroups}
                selected_students_in_groups={this.state.selected_students_in_groups}
                onSelectedStudentsInGroupsChange={this.updateSelectedStudentsInGroups}
                refresh={this.refresh} />
              <GroupsActionsColumn refresh={this.refresh}
                performAction={this.performAction} />
              <GroupsGradingTable ref="groupsTable"
                groups={this.state.reviewee_groups}
                selected_groups={this.state.selected_groups}
                onSelectedGroupsChange={this.updateSelectedGroups}
  
negative.code:   });
  
    // The table of groups on the right.
    var RevieweeTable = React.createClass({
      getDefaultProps: function() {
        return {
          columns: [
  