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.

Q: Sentence 1:The symplectic group acts transitively on complex structures by conjugation . Sentence 2:Moreover , the subgroup commuting with J is naturally identified with the unitary group for the corresponding complex inner product space .

A: moreover
****
Q: Sentence 1:The first negative speaker should always make some points in rebuttal at this stage of the speech . Sentence 2:However , such rebuttal should be kept short .

A: however
****
Q: Sentence 1:Each of the bridge 's arches carries a head of Dionysus carved in stone . Sentence 2:Additionally , its piles are decorated on each side with a ram 's head .

A:
additionally
****