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I have lived all my life as an English speaker, and I am also stumped by the lyrics by Lennon. I have just noticed the pattern that Lennon's songs sound good musically, but they are not about lyrics. I am not sure what Lennon was doing with lyrics, or if he was trying to do anything-- but whatever it was it was not about straightforward communication. If you want understandable lyrics, then look for songs by McCartney or Harrison. I think Lennon may have been trying to use lyrics as some sort of percussion with disconnected ideas flying around. (Don't take that too seriously).
