list( $n, $display ) = $this->makeNextCond( $dbw, [ $primaryKey ], $lastRow );
$next = [ $n ];
$this->output( "... $display\n" );
list( $n, $display ) = $this->makeNextCond( $dbw, [ $primaryKey ], $lastRow );
$next = [ $n ];
$this->output( "... $display\n" );