use strict;
use warnings;
my $infile = shift;
my $found_E = 0;
my $sets = 0;
open my $ifh, '<', $infile;
while(<$ifh>) {
if (/^E/) {
$found_E = 1;
next;
}
if ($found_E) {
if (/^G/) {
$sets += 1;
$found_E = 0;
next;
}
if (/^h/) {
print "Error! Found h before G\n";
exit;
}
}
}
close($ifh);
printf "Found %d sets from E to G uninterrupted by h\n",$sets;
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