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:By measuring the thickness of individual rings , it has been assumed ( at least in some species ) to estimate fish growth because fish growth is directly proportional to otolith growth . Sentence 2:However , some studies disprove a direct link between body growth and otolith growth .

Ex Output:
however

Ex Input:
Sentence 1:Two days later , it was announced he and Borussia Dortmund would not be extending their contract after it expired after 30 July 2016 . Sentence 2:However , on 1 July 2015 , he signed a contract extension to keep him at the club until 2017 .

Ex Output:
however

Ex Input:
Sentence 1:A unique characteristic of Arasbaran forests is the ubiquity of edible wild trees . Sentence 2:For instance , a patch of forest between Aghaweye and Oskolou includes hazelnut trees .

Ex Output:
for instance