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  1. or download this
    if ( $tree->{VALUE} > $value ) { insert( $tree->{LEFT}, $value ) }
    elsif ( $tree->{VALUE} < $value ) { insert( $tree->{RIGHT}, $value )
    
  2. or download this
    if ( $tree->{VALUE} > $value ) { insert( $tree->{LEFT}, $value ) }
    elsif ( $tree->{VALUE} < $value ) { insert( $tree->{RIGHT}, $value ) 
    else { warn "$value duplicated" }
    
  3. or download this
    if ( $tree->{VALUE} >= $value ) { insert( $tree->{LEFT}, $value ) }
    elsif ( $tree->{VALUE} < $value ) { insert( $tree->{RIGHT}, $value )