So, in "Perl6" you would write a seven-line subroutine to define a custom operand, and *then* you could write:
my %missing-words = %book-words - %dictionary;
Whereas in Perl you could use built-ins (avoiding potential errors, and taking advantage of low-level optimizations) and simply write:
my %missing = map { $_ => 1 } grep { ! exists $dict{ $_ } } keys %book
+;
That's a great example of how not useful the butterfly's bells and whistles are *in real life.*
(Oh, and I see you showing off your 'hyphens-in-var-names' bell-and-whistle, but honestly, all that does is make the code less readable.)
Not impressed.
The way forward always starts with a minimal test.
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