b 



: ' .. . - 1 c . ) is ver; 

 i - that 



. 



type. In - 

 so closel; 

 prece. , ■ cavity is fori 



distinct 



■ e cell is 

 left is 



r hi 



- 



Two . siz;v of 



ceil: 



Lat . 



ill . . nor- 



t for this sta^-e, 



