Commas
In some cases you can separate a series of items by commas:
parameters in a CALL or USING statement, a list of VALUES on an
88-level, targets of a MOVE, and so forth.
However, such commas are not necessary.
Recommendation
Don't use commas when you don't need them. They add nothing but
clutter. They may even be misleading when the reader mistakes a comma
for a period, due to poor print quality, a poor choice of fonts, or
poor eyesight.
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