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:It excludes problems with flow separation at sea level and increases efficiency of the engine in vacuum . Sentence 2:For example , application of nozzle extension for liquid rocket engine NK - 33 improves the value of specific impulse up to 15 - 20 sec for near - space conditions .
answer:
for example


question:
Sentence 1:A year later , in 1973 , Dion and the original Belmonts performed once more , doing a sold out concert at the Nassau Coliseum on Long Island , New York . Sentence 2:However , no recording of the 1973 reunion was ever released .
answer:
however


question:
Sentence 1:In 2000 , Meijin - 2000 played against human players in Moscow Open Tournament . Sentence 2:However , not until 2017 were the computer programs proved to be able to outperform top human players in public competitions .
answer:

however