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Two distinct point pairs and
separate each other if
,
,
, and
lie on a Circle (or line) in
such order that either of the arcs (or the line segment
) contains one but not both of
and
. In addition, the
point pairs separate each other if every Circle through
and
intersects (or coincides with) every
Circle through
and
. If the point pairs separate each other, then the symbol
is used.