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my $s = q[dogs OR cats AND "flying fish" OR (shrimp AND squid)];

my $s = q[dogs OR cats OR "flying fish" OR (shrimp AND squid)];

my $s = q[OR dogs OR cats OR "flying fish" OR (shrimp AND squid)];

$VAR1 = [
  "OR",
...
    [ term => "squid"  ],
  ]
];