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:These small howitzers provided artillery support for mobile military forces where it would otherwise be unavailable . Sentence 2:However , their shorter range made them unsuitable for dueling with other heavier field artillery weapons .
Example Output: however

Example Input: Sentence 1:The mine starts as an epidermal corridor , but later becomes a shallow tentiform mine . Sentence 2:In the end , the larva lives freely under a folded leaf tip .
Example Output: in the end

Example Input: Sentence 1:The curvature of the sample is dependent on elastic moduli , swelling ratios , and ratios of layer thickness and bilayer thickness . Sentence 2:Thus , the adjusted models that describe mean curvature and Gaussian curvature are , respectively ,
Example Output:
thus