I have a file with values like below 

1. This is just a sample.
2. This is to check 
3. How a set of values 
4. can be replaced by another 
5. set of values and that too 
6. in the most efficient way.

[download]

I was to replace the 1,2,3,4,5,6 values to a, b ,c, d,e ,f. The final file should look like below:

a. This is just a sample.
b. This is to check 
c. How a set of values 
d. can be replaced by another 
e. set of values and that too 
f. in the most efficient way.

[download]
What would be the faster or the most efficient way to do this ?

In reply to Efficient way to replace a set of values with another set of values by darklord_999

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