if ( $tss{ $ids[ $first ] }{ start } > $tss{ $ids[ $second ] }{ stop  }
            or     $tss{ $ids[ $first ] }{ stop  } < $tss{ $ids[ $second ] }{ start } ){
               # No Overlap  
            }else{
               push @toDelete, $ids[ $first ];  # <<<< Note: changed $first to $ids[first]
               last;           # <<<< Added 'last' to avoid deleting $first multiple times
            }