How do I arrange four variables on a K-map?

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Homework Statement



There are four variable(x3,x2.x1,x0),how should I put them on a K-map?
Is it like that?


The Attempt at a Solution



Handwritten Karnaugh map for four variables, with X1X0 labelling the columns and X3X2 the rows, and the 1-cells circled in groups; below it are the Sum of Products expression and the NAND form with its circuit diagram.
 
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  • Handwritten 4-variable Karnaugh map with rows labelled X3X2 and columns labelled X1X0, grouped loops marked, below it the Sum of Products and NAND form expressions and a NAND logic circuit diagram.
    20140315_230221.jpg
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Discussion

Looks good to me except shouldn't your second term be ##X_3'X_1\,##?
 

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