```ruby
module Polytexnic
  FORMATS = %w{html pdf epub mobi}
  BUILD_ALL_FORMATS = %w{pdf mobi}  # mobi calls epub, which calls html
end
```

Order the builds so that PDF is last
user
```ruby
module Polytexnic
  FORMATS = %w{html epub mobi pdf}
  BUILD_ALL_FORMATS = %w{mobi pdf}  # mobi calls epub, which calls html
end
```
assistant