$hash1{\@elements}++;

##</code><code>##

$hash1{[@elements]++;

##</code><code>##

$hash1{$line}++;

##</code><code>##

$hash1{"some key"} = \@elements;

##</code><code>##

  DB<1>  @elements = qw/ 1 3 5 4 6/;

  DB<2> push @array, \@elements;

  DB<3>  @elements2 = qw/ 12 13 14 15/;

  DB<4> push @array, \@elements2;

  DB<5> x \@array
0  ARRAY(0x600509af0)
   0  ARRAY(0x600500b38)
      0  1
      1  3
      2  5
      3  4
      4  6
   1  ARRAY(0x600500928)
      0  12
      1  13
      2  14
      3  15