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my @vars = do {
    my %seen;
    grep !$seen{$_}++, $bool_func =~ /([a-zA-Z]\w*)/g;
};

for my $assignment ( 0 .. (2**@vars)-1 ) {
    my %val;
...
    $val{$vars[$_]} = ( $assignment >> $_ ) & 1
        for 0 .. $#vars;
.........