Add words to eng trained data file

[Donald Winston]

I've a simple question:

Can I add the following to configs/hocr?

user_words_suffix user-words

Where tessdata/eng.user-words contains some unusual chemistry words.

Will Tesseract  include the additional words along with the current eng.traineddata when it does it's thing or do I have to create a new (say sci.traineddata) file using the combine_tesseract command?

I'm using Tesseract 3.03/Linux (command line not api)

[shrawan business]

i also want to achieve the chemistry formula conversion using tesseract. do you have any  tessdata training data available or any link  please share