85.
It is more difficult to see patterns of
plotted squares on a 16-square Veitch
diagram than it is on an eight-square
diagram.
Look for patterns which are formed
by adjacent squares or by squares at
opposite ends of rows.
Some examples are
shown below.
These eight squares are
adjacent and common only
to variable D.
These eight squares
are at opposite ends of
rows and common only to
variable D.
These four squares are
adjacent and common only
to variables AB.
IT0345
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