I ran Paul's code on a sample of 100 instances "therefore" with the following results:
therefore - 15
hence - 20
that is - 13
on this basis we can conclude - 17
so we can conclude that - 14
so we conclude that - 10
in other words - 11
You will need to consider context of course. Some of the replacements would looks silly in say:
The pool is only 6 inches deep. We therefore strictly prohibit diving from either side.
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