https://books.google.com/books?id=e35JCAAAQBAJ&pg=PT139&lpg=PT139&dq=taligent+Aaron+Hillegass,&source=bl&ots=VGTriuTmE4&sig=ACfU3U0BS9ypil2LRv-OULhT63NBUpAh5Q&h

https://books.google.com/books?id=e35JCAAAQBAJ&pg=PT139&lpg=PT139&dq=taligent+Aaron+Hillegass,&source=bl&ots=VGTriuTmE4&sig=ACfU3U0BS9ypil2LRv-OULhT63NBUpAh5Q&hl=en&sa=X&ved=2ahUKEwjshOuS9fPjAhUYWs0KHUP2CnAQ6AEwA3oECAMQAQ#v=onepage&q=taligent%20Aaron%20Hillegass%2C&f=false https://books.google.com/books?id=e35JCAAAQBAJ&pg=PT139&lpg=... Gives the basics of the difference