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my %hash = ( a=>0, b=>1, c=>0, d=>3 );
foreach my $k ( sort { $hash{$a} <=> $hash{$b} or $a cmp $b } keys %ha
+sh  ) {
    print "$k = $hash{$k}\n";
}

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```
a = 0
c = 0
b = 1
d = 3
```