<p>Thanks for solving my question. Then, I suppose Ph 1b covers first 4~5 chapters of Purcell, so I can study them without any special extra materials. Thanks for your help. </p>
<p>Thanks for solving my question. Then, I suppose Ph 1b covers first 4~5 chapters of Purcell, so I can study them without any special extra materials. Thanks for your help. </p>