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    $res .= sprintf "%dw", $weeks   if $weeks;
    $res .= sprintf "%dd", $days    if $days;
    $res .= sprintf "%dh", $hours   if $hours;
    $res .= sprintf "%dm", $minutes if $minutes;
    $res .= sprintf '%ds', $seconds;

 $res .= sprintf "%dw", $weeks   if                                $we
+eks;
 $res .= sprintf "%dd", $days    if                       $days or $we
+eks;
 $res .= sprintf "%dh", $hours   if             $hours or $days or $we
+eks;
 $res .= sprintf "%dm", $minutes if $minutes or $hours or $days or $we
+eks;
 $res .= sprintf '%ds', $seconds;