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.

Example Input: Sentence 1:On the overground parts of the network trams drive at sight , while the underground premetro sections have block signalling . Sentence 2:However drivers do not need to check in and out of the signalled section as on the Muni system in San Francisco .
Example Output: however

Example Input: Sentence 1:The collector current does not remain constant with variation in temperature or power supply voltage . Sentence 2:Therefore , the operating point is unstable .
Example Output: therefore

Example Input: Sentence 1:The Thunder defeated the Borregos 31 - 19 and are still the only American team to defeat the Borregos . Sentence 2:Additionally , the Thunder set a national scoring record with a 104 - 6 victory over the Austin Gamebreakers in the WFL semi-finals .
Example Output:
additionally