I have the two following lists:

l1 = [1, 2, ,3]  
l2 = [x, y]

And would like to have all lists of 5 elements keeping the order of l1 only. Say: 

[x, y, 1, 2, 3],  
[x, 1, y, 2, 3],  
[x, 1, 2, y, 3],  
[x, 1, 2, 3, y],  
[y, x, 1, 2, 3],  
[y, 1, x, 2, 3],  
[y, 1, 2, x, 3],  
[y, 1, 2, 3, x],  
[1, x, y, 2, 3],  
[1, x, 2, y, 3],  
[1, x, 2, 3, y],  
[1, y, x, 2, 3],  
[1, y, 2, x, 3],  
[1, y, 2, 3, x],  
...  
[1, 2, 3, y, x],  
...  
[1, 2, 3, x, y]

Observe that the order of l1 is important and l2 is not. l2 elements run over l1+l2 positions but only the order of l1 is important. I'm struggling with this. Any help is appreciated.

python list combinations
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