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  1. or download this
    if ($rec{NOTE­} && exists $rec{NOTE}­{Nested}) {
  2. or download this
    if(  exists ${ $rec{NOTE­} || {} }{Nested}  ) {
# or
if(  ( $rec{NOTE­} || {} )->{Nested}  ) {
# or
if(  exist +( $rec{NOTE­} || {} )->{Nested}  ) {