instruction:
In this task, you are given two sentences in the English language (Sentence 1 and Sentence 2). Your task is to identify the connecting word between the two sentences.
question:
Sentence 1:A group of hand surgeons realized in the 1970s that the level of injury did not predict the number of available muscles in the upper limb very well . Sentence 2:Therefore , the international classification was established in 1979 , at the Edinburgh meeting .
answer:
therefore


question:
Sentence 1:In the original Fox press release , Peter Wolf and Harry Hamlin were announced as guest stars for this episode . Sentence 2:However , neither of them made an appearance in the broadcast version .
answer:
however


question:
Sentence 1:Such a restriction lowers the proof - theoretic strength of the system significantly . Sentence 2:For example , the system ACA described below is equiconsistent with Peano arithmetic .
answer:

for example