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The Oxford comma is called the
comma in the USA. It is used before the
"and" or "or" in a
of three or more
. People say an Oxford comma is
on the 50-pence coin because the
is very clear. A word
said the Oxford comma helps to understand the writer's
. A woman said the comma wasn't
. She tweeted: "It doesn't matter if there is a comma or not. The most important
is that there is peace."