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#!/usr/bin/perl -w
...
}
my $BS=$res/$candidate_count;
print "The calculated bleu Score is:$BS\n";

it is not
is not probably
...
that it is
it is the
is the end

Key    Candidate  Reference    MinCount
...
that   1          1                   1
the    1          1                   1
The calculated bleu Score is:0.666666666666667