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.

Input: Consider Input: 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 .

Output: therefore


Input: Consider Input: Sentence 1:The mechanisms for infection , proliferation , and persistence of a virus in cells of the host are crucial for its survival . Sentence 2:For example , some diseases such as measles employ a strategy whereby it must spread to a series of hosts .

Output: for example


Input: Consider Input: Sentence 1:Billy Taylor and Don Gallinger , now middle - aged , were finally forgiven for their gambling in 1948 and were reinstated to the NHL . Sentence 2:However , they did not return to the NHL .


Output: however