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a few parts are wrong... Sabbath songs aren't hard IMO so I don't know how this can be
I agree on the bass instead of playing 8^10 on the e it could be 3^5 on the a string...
Difficulty is a highly subjective thing. Also, whether to play the low octaves of the E or the A is highly subjective thing - for example, I have more than one bass and they each have their own sound, such that I may play the start of the main riff on the 3^5 on one, but use 8^10 on another. All in all, it's a very good tab.