Setting up a four-variable Karnaugh Map, writing homework help

Simplify Z using a four-variable map-entered variables.  ABCD represents the state of a control circuit.  Assume that the circuit can never be in state 0100 0001. or 1001.

Z=BC’DE + ACDF’ + ABCD’F’ + ABC’D’G + B’CD + ABC’D’H’

I’ve never seen a question phrased like this before and I’m not sure how to approach it.  There are more than 4 variables.  How do I set something like this up?  It is from Digital Systems Design using VHDL, Roth https://books.google.com/books?id=rKueAwAAQBAJ&pg Page 43

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