Two at a time


You have 8 stones, 4 white and 4 blue, arranged as shown below. By moving two adjoining stones without changing their sequence, rearrange the stones so that all the blue stones are on the right, and the white stones on the left. The stones may only occupy the blank spaces. Try to achieve this in 4 steps.
   
1 2 3 4 5 6 7 8 9 10

Step 1
1 2 3 4 5 6 7 8 9 10
   

Step 2
1 2 3 4 5 6 7 8 9 10
   

Step 3
1 2 3 4 5 6 7 8 9 10
   

Step 4
1 2 3 4 5 6 7 8 9 10
   


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