Please note that what you getting is a warning, not an error. Warnings alert you of situations that can lead to possible problems, but they do not terminate your programs like errors do. For eg.
my $string; # $string is declared but not initialized!
so any operation you do on '$string' (except an assignment) will produce the warning message, if you use 'use warnings' or -w option.
check the value of "$moh" variable before comparing.
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