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my @array1 = qw(c d e);
my @array2 = qw(e f g h);
# my @array3 = qw(a b d);  # original code
my @array3 = qw(a a b d);  # modified for test
my @array4 = qw(s g h j k l);

@array0, @array1: e - 1
@array0, @array2: a d - 2
...
@array1, @array2: a - 1
@array1, @array3: g h - 2
@array2, @array3: a - 1