 The analysis continues with an attempt to “deduct” the fallacies based on the idea that when a false conclusion is reached, then at least one of the characteristic conditions of syllogistic reasoning must not have been met. It then proceeds to articulate a detailed account of the different ways in which failure to meet those conditions corresponds to different items in Aristotle’s famous list of thirteen fallacies, which Avicenna occasionally groups or divides in slightly different ways, especially in the case of those that are dependent on expression.