instruction:
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.
question:
Sentence 1:All trace of that entrance has vanished , for the whole southwestern section of the walls underwent many extensive alterations over the centuries . Sentence 2:However , that stretch of wall appeared in a print produced in the 18th century .
answer:
however

question:
Sentence 1:Most of PCPD pump failures are due to this elastomer part . Sentence 2:However , the operating conditions and environment should not degrade or induce mechanical failure of the elastomer part for the life of the equipment .
answer:
however

question:
Sentence 1:The rotweiler tries to break back in using a log . Sentence 2:But upon doing so , the rotweiler overshoots and falls into a canyon which is on the other side of the house .
answer:
but