K-map with don't-cares

Implement the circuit described by the Karnaugh map below. Cells marked d are don't-cares: the original specification allows either output value there, and you would normally choose whichever value gives the simplest circuit.

	a'b'	a'b	ab	ab'
c'd'	d	0	1	1
c'd	0	0	d	d
cd	0	1	1	1
cd'	0	1	1	1

For grading, treat the don't-cares as follows (these are the values the standard minimal solution produces): the d at a'b'c'd' (abcd = 0000) is 0, and the two ds at abc'd (1101) and ab'c'd (1001) are both 1.