From the name itself a 'putting-together' seems to indicate some combination of sentences, just as a voting-together [is a combination] of votes. A deductive argument is a tool to make evident something that does not seem knowable through both some knowable and evident [premises]. And since every tool is useful, then, a deductive argument is useful, too. But every tool that does not supply its own usefulness is removed. A deductive argument is [a set of] premises accompanied by a conclusion.