According to Aristotle, what is an "artless" proof?

Aristotle mentioned that of various types of persuasion, some of them are certainly the art of self-importance while some are not. And by the artless proof, he meant the things that are not provided by the orator but are available at the outset such as the pieces of evidence, witnesses, contracts, and the long list follows. And these we can construct by our construct through the rhetoric principles. And the one kind is just for application and usage, and the other needs to be invented.

Explanation:

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the major difference between the two is the objective and the reward of the game. candy crush has a puzzle theme with the objective of meeting a specific quota of points or objects, you are able to gain access to the next level and compete with peers on the process. on duolingo the objective is rather different, you are given sets of questions for you to answer for you to move to the next level and as for the reward, you are able to learn available language as this is an app developed to teach the user about other languages.