Small code fixes and some textual edits #69
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The code needs some minor changes to compile if copy-pasted from the text.
I assumed that I could use the following to both slice and insert code at the same time, if that doesn't work there is a problem with my commit:
I was (/am) a bit confused by the output of parse being a list of tuples while everywhere we seem to deal with a list of a single tuple or the empty list. I hypothesized why this would be and added that to the text but I'm not sure it's correct.
In a couple of places the code seems clipped, often a line at the beginning is missing which seems like it should be there. However, the numbers given in the slice do seem to correspond to the numbers I see when I look up the source. I'm not sure what's going wrong here (no changes made on this).