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?