Here is my version of the generate sub. Won't probably run on Pugs right now.

use v6;

sub generate {
    when List  { .map:{ generate $_ } }
    when %dict { generate %dict{$_}.pick }
    default    { [ $phrase ] }
}
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For some reason I'm assuming that $_ is aliased to the first argument of a sub when there is no signature specified. If that's wrong, please tell me!