As far as I understand recur is going back to the loop  so number is never 
going back to 0 
but I see the problem (-(count coll)2 is changing it value and that schould 
not happen. 
So I think I have to set the initial value of counter in the let. 

what schould happen is this 

       coll            number    counter 
1)   [1,2,3.4.5)     0             3
2)   [2.3,4,5]        1             3
3)   [3,4,5]           2             3
4) [ 4,5]               3             3

so the (first coll) is executed which is 4. 

Am I at the right track now. 



Roelof

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