Either make a copy of Chap12-1.js and rename it to CArray.js or make a symbolic link. Or else codes won't run, ``` bash $ grep 'load("CArray.js")' * Chap12-10.js:load("CArray.js") Chap12-11.js:load("CArray.js") Chap12-12.js:load("CArray.js"); ```