Even without reading the code, you can prepend use strict; and run it; and Perl will tell you: 
Can't use string ("") as a HASH ref while "strict refs" in use at ./3o
+.pl line 25.

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So, here: 

                next if(exists $$href{$word}{written});

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لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re^2: desire hard ref alternative by choroba
in thread desire hard ref alternative by plevine

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