The challenge is only to iterate all the 2-member subsets of the set on a per line basis. For example: use Data::Dumper;
my %pairs = ();
while (<>) {
chomp;
my @found = split;
for my $k1 ( @found );
for my $k2 ( @found ) {
if ( $k2 gt $k1 ) { # ensuring each pair is counted once o
+nly for the line
$pairs{ $k1 }{ $k2 }++;
}
}
}
}
print Dumper \%pairs;
(updated thanks to syntax catch by Wind)
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