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#!/usr/bin/perl -w

use strict;
...
#delete($href1);
#delete($href2);

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$ ./hashreftest2.pl 
$HoH{flintstones}: HASH(0x7ce220)
$href1: HASH(0x7ce220)
$href2: HASH(0x7ce220)
$href3->{flintstones}: HASH(0x7ce220)