OK, my understanding of note a in this particular table is that for a standard 12.00m length of pipe, the outer 0.1m at either end is regarded as the "pipe end", with the remaining middle section 11.8m long regarded as the "Pipe except the end".
In some other places in API 5L, the "pipe end" means exactly that - the end of the pipe. Some sections then also include 0.1m or 0.2m of the pipe within the requirements of the "pipe end" so that e.g. if the pipe needs to be cut back a small amount, or a weld needs to be cut out, the same conditions at the new "pipe end" will be the same as the old "pipe end".
Does that help?
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