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 Q]: Sentence 1:On systems or services using NTLM authentication , users ' passwords are never sent in cleartext over the wire . Sentence 2:Instead , they are provided to the requesting system , like a domain controller , as a hash in a response to a challenge - response authentication scheme .
[EX A]: instead

[EX Q]: Sentence 1:If that hypothesis is rejected , one can use OLS . Sentence 2:However , if the presence of a unit root is not rejected , then one should apply the difference operator to the series .
[EX A]: however

[EX Q]: Sentence 1:The diagnosis of RA was formerly based on detection of rheumatoid factor ( RF ) . Sentence 2:However , RF is also associated with other autoimmune diseases .
[EX A]:
however