> Please look at the definition and initialization of the hash.  It is a hash 
> of array references, isn't it?  Why does
> $HoA{"flintstone"}[0]      work, why is not it:   $HoA{"flintstone"}->[0]     
>     ????

perldoc perlref
Section: Using References
Paragraph 3

....
$array[$x]->{"foo"}->[0] = "January";
.....
One more thing here.  The arrow is optional between brackets 
subscripts, so you can shrink the above down to
$array[$x]{"foo"}[0] = "January";
.....


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