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$a = [ [1],[2],[3] ];;

...

print @{$a}[1];;
ARRAY(0x1b7ae0)

print @{ $a[1] };;
2

print @$a->[1];;
Using an array as a reference is deprecated at (eval 15) line 1, <STDI
+N> line 7.
ARRAY(0x1b7ae0)

print @{ $a->[1] };;
2