How to implement k-map for 4 bit input using Quine-McCluskey Method

Question

I have done it till 68th slide of this file

http://webdocs.cs.ualberta.ca/~amaral/courses/329/webslides/Topic5-QuineMcCluskey/Topic5-QuineMcCluskey.PPT

But i don't know how to further implement it and get right answer.

The problem i am facing is how i can do that.

   0,1,8,9     -00-
   0,2,8,10    -0-0
   2,6,10,14   --10

i have generated above pairing like -00-, -0-0 but how i can assign it value 0,1,8,9, or 0,2,8,10