● Fixed typos; non-standard spelling and dialect retained.
● Added table of Contents.
● Enclosed italics font in _underscores_.
● Enclosed bold or blackletter font in =equals=.
● The caret (^) is used to indicate superscript, whether applied to a
single character (as in 2^d) or to an entire expression (as in
1^{st}).
● Subscripts are shown using an underscore (_) with curly braces { },
as in H_{2}O.