[bug #53413] [PATCH] Add hyphenation patterns to use with US and hy=48

[Bjarni Ingi Gislason]

Follow-up Comment #5, bug #53413 (project groff):

  The number 8 is high enough to prohibit wrong hyphenations caused by
odd numbers less than 9.

  It is more important to avoid wrong hyphenations than finding
patterns for rare ones.

  And the last used number should be an even number to eliminate wrong
patterns found earlier.

  [If 9 is used, maybe '0' could be used as a counterbalance?]

  I am not saying that hy=48 should be default.  Users may (are free
to, this is "free" software) choose for themselves any defined value
(irrespective of the used main-hyphenation file).

  I use hy=48 with the additional files for my own writing; for reading
man pages, no hyphenations (waste of resources).
I have not noticed any irregularities.

  The additional files just lessen the chance of seeing wrong
hyphenations, as long as the algorithm does not take care of the issue.

N.B.
  The files need a prolog to explain it, like

% These patterns avoid false hyphenations for US English with the
% current (April 2018) algorithm in groff and values of ".hy" that allow
% splitting of one character.


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