In Section 9.4 there's a sentence with an extra word
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| Edition | Second | 
|---|---|
| Version number | 3.0h | 
| Submission date | 11/7/2016 | 
| Your name | Chanud Yasanayake | 
| E-mail address | cyasanay@caltech.edu | 
| Chapter | 9.4 | 
| Page number | 9-23 | 
| Line number | -4 | 
| Current status | Closed | 
"We see that the s+a term it does not appear" shouldn't have the "it".

