Most sound shifts are because the mouth positions for the letters in question are effectively the same; F and P differ only in the lips, same with B and V. (I believe B and P also shift into each other, though not as readily; the difference there is voiced vs. unvoiced.)
This is the short version of this comment. I'm quite certain that oneironaut will be along soon enough to provide the long version. ;)
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Date: 2005-02-10 05:42 am (UTC)This is the short version of this comment. I'm quite certain that