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second simple problem


Dear sirs:
I have the following list:
ex={1,5,7,4,"M",6,7,8,9,1,"M",3}
I want to replace the M's in the following way: the first M by 5, and the second by2.
Thus I have a replacement list
rL={5,2}
The problem is to get ={1,5,7,4,5,6,7,8,9,1,2,3}
How can I do this in the most general form (for any length of ex and any number of values of "M")?
Thanks
Francisco      


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