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.

Ex Input:
Sentence 1:The Opel vehicles sold in the 1960s and 1970s are exceptions to this rule because they were sold through the Buick distribution channel , while retaining the Opel brand name . Sentence 2:Thus , they are captive imports .

Ex Output:
thus


Ex Input:
Sentence 1:PrP has been detected in the blood of sick animals by means of PMCA technology . Sentence 2:However , repeated cycling over several days , which is necessary for PMCA of blood material , has been reported to result in decreased specificity ( false positives ) .

Ex Output:
however


Ex Input:
Sentence 1:High resolution images have demonstrated that the craters formed at about the same time since the ejecta from each crater does not overlay neighboring craters . Sentence 2:However , there are still some scientists who believe that this chain of craters may be volcanic in origin .

Ex Output:

however