This code triggers the complaint below:

#!/usr/bin/perl 
use strict;
use warnings;

my $s = "aaa bbb";
my $num_of_item = split(/\s+/, $s) ;
print $num_of_item;

When I run the code, Perl complains that "Use of implicit split to @_ is deprecated" . I really have no "context" for the problem, so I expect you help to explain what's wrong with the code.

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