First Try: Minimize each map, ignore shared terms

AB

01

0

0

1

0

00

CD

00

0

0

1

0

01

11

10

X

1

X

1

X

X

X

X

11

10

F2

F3 = A + B’CD’ + B’CD’

AB

01

1

1

1

1

00

CD

00

0

1

1

0

01

11

10

X

1

X

1

X

X

X

X

11

10

F4

F4 = A + C’ + BD + B’D’

But F4 is simply F1 + F2 + F3

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