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use warnings;
use strict;
...
}

print Dumper(\%hash);

print %{ $hash{$lname}{$fname}{$score} }\n";

C:\Perl\bin>perl test16.pl test.txt
Global symbol "$lname" requires explicit package name at test16.pl lin
+e 12.
Global symbol "$fname" requires explicit package name at test16.pl lin
+e 12.
Global symbol "$score" requires explicit package name at test16.pl lin
+e 12.
Execution of test16.pl aborted due to compilation errors.