Xu, I'm at a loss now as how to proceed as listed by xiaoz.
   8) Start concord and use file-based concordances;
   9) Type in Path:\file1.txt (Path=the folder you save file1.txt) e.g. C:\file1.txt and      Press  Load;
   10) In advanced search copy the string item1/item2/item3...etc into the box for context;
   11) Set L=0 and R=n (n>0, the greater n is, the noisy the result contains);
   12) search as usual.
where should I type in the path in xaira?