Context: The jat-reflex rules are not without exception. For example, when short jat is preceded by r, in most Ijekavian dialects developed into /re/ or, occasionally, /ri/. The prefix prě- ("trans-, over-") when long became pre- in eastern Ijekavian dialects but to prije- in western dialects; in Ikavian pronunciation, it also evolved into pre- or prije- due to potential ambiguity with pri- ("approach, come close to"). For verbs that had -ěti in their infinitive, the past participle ending -ěl evolved into -io in Ijekavian Neoštokavian.

Question: To what did the ending -ei evolve into in Ijekavian Neostokavian?
Answer: -io

Question: What is the western equivalent of the prefix "pre"?
Answer: prije

Question: Why did pre or prije develop rather than the symboled "pre"?
Answer: due to potential ambiguity with pri

Question: What is the meaning of "pri"?
Answer: approach, come close to

Question: What did the short jat preceeded by r develop into in western dialects?
Answer: Unanswerable

Question: What are the past participle rules not without?
Answer: Unanswerable

Question: In western Neostokavian dialects what did the pre prefix become when its long?
Answer: Unanswerable

Question: In Ikavian pronunications what did ri evolve into?
Answer: Unanswerable

Question: Why did re or ri develop instead of pre?
Answer: Unanswerable