Lesson 7: things that are the same, and things that aren't

Vocab:  https://docs.google.com/spreadsheet/ccc?key=0AtQqEPy2V7lNdDl5V0N1Z0dMNXFTYkF4V2l5bk8xT2c

7a:  https://docs.google.com/document/d/1W91KyfjDkyYCm8anaSfXjmVQA5_bqw5v1Xwz8xaqRkQ/edit

7b:
https://docs.google.com/document/d/1pt74fVUX_SEnEI4IQnUualal-QoCOm8HE7-8l0jLDDY/edit