According to J.H.W. Penney, there are three views on the difference between Tocharian B päst and pest 'away': (1) Pest is stressed and päst unstressed. (2) Päst - *pe-sth2-u and pest - *po-sth2-u. (3) -We are dealing with a vowel which began as something that could be written as 'e' but was not identical to the 'e' that survived intact, and which at the time of the reordering of the Tocharian B vowel system shifted to fill the slot left vacant by the move of earlier stressed 'ä' to 'a' -. The present writer believes that päst is the basic form, while pest arose by what he calls irregular sound change due to frequency.
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