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    Use of uninitialized value in numeric comparison (<=>) at tmp.pl line 
+10.
Use of uninitialized value in numeric comparison (<=>) at tmp.pl line 
+10.
...
Use of uninitialized value in numeric comparison (<=>) at tmp.pl line 
+10.
Use of uninitialized value in numeric comparison (<=>) at tmp.pl line 
+10.
APR12 MAR13 APR11 MAR12 FEB13 APR13
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    ...

use Data::Dumper;
exists $mon->{JAN}
    or die "Couldn't find entry for 'JAN' in " . Dumper $mon;