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I have a large file (10M lines) that contains two columns: a frequency and a string, ex:

3 aaaaa
4 bbbbb
2 ccccc
5 aaaaa
1 ddddd
4 ccccc

I need to merge the lines whose string part is the...

I have the following problem:
I have two files: S containing sentences (one in each row) and W containing files (one in each row). It might look like this:

S:
a b c apple d.
e f orange g.
h...