foreach (@masterarrray) {
   my @array = @$_;
   print int @array; # prints the length of the array
   print "@array"; # prints the contents
   # ... etc ...
}

##</code><code>##

foreach (@masterarrray) {
   print int @$_; # prints the length of the array
   print "@$_"; # prints the contents
   print $$_[0]; # prints the 0th element
   # ... etc ...
}