IBM Software Developer Intern interview questions

After a few exchange of emails about my profile and work interest, I received a phone call from the Project Manager. I was asked about my previous work experience and current academic status and interests. A skype interview was scheduled later a week later. It was a 45 min skype interview. Few simple concepts of object oriented programming were asked. Then I was asked to code a solution to the question : "Given a sentence and a set of words, how do you find out if the given sentence can be formed using the given set of words?". I was asked to email the complete code that I verbally solved over the skype call.