Cover Extraction

??Covers can be generated with as many "don't cares" in the present state part as possible.

a

b

w

x

c

d

?

d=1

d=0

c=1

c=0

a=0

a=1

a=0

a=1

ON

abcd

????11

0??01

0????0

OFF

abcd

1??01

1????0

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