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%mapp = ();
@arr = ("R", "T", "HH", "M");
$mapp{"FirstKey"} = \@arr;
...
push(@val, "RBB");
$mapp{"FirstKey"} = \@val;
print join (",", @{$mapp{"FirstKey"}}) . "\n";  #an array reference wi
+ll be printed

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```
R,T,HH,M
ARRAY(0x7ffafc013bf8),RBB
```