I've a question regarding variable variable I was hoping someone could help me with:

All the examples in the manual have the entire variable name being variable e.g.
$a = "hello"   and
$$a being the same as $hello

What I need to do, however, is append a variable portion to a constant prefix.  So I 
have a set of variables that are named $MYdog, $MYcat etc. and I need to do

$a = "dog"
${"MY$a"} being the same as $MYdog

Can this be done, and if so - how? I can't get it to work.


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