 In contrast, five other texts from this period not only mention and sometimes discuss terms pertinent to inference and debate but also provide illustrations of the terms. The earliest texts are two passages in the earliest medical work, the Caraka-saṃhitā, conjectured by some to have been redacted in its current form at the beginning of first century ce. Another important passage occurs in the Yogācāra-bhūmi-śāstra (Treatise on the stages of the practice of yoga), a work traditionally attributed to Asaṅga, but now generally thought to be by a number of authors. The passage, usually referred to as Hetu-vidyā (Science of reasons), provides some fifty examples of simple common sense inferences, all of which are easily recast in the form of the inferential syllogism given above. The inferences are divided into five categories. While relation words are used for each category, the logical force of these relations is not made clear. The inferences provided include ones such as the inference of fire from smoke, of the presence of a lion from its roar, of being sick from unusual eating practices, as well as inferences more closely connected with Buddhist doctrine.