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  1. or download this
    foreach my $sequence (@bigram) {
    #my $count;   is this a bug?
...
        $prev = $word;
    }
}
  2. or download this
    a b n z
d f n z
v
  3. or download this
    n_z occurs 2 times
a_b occurs 1 times
d_f occurs 1 times
f_n occurs 1 times
b_n occurs 1 times