Suppose I have: 

db.define_table('table_a', 
    Field('name'),
    )

db.define_table('table_b',
    Field('my_a', 'list:reference table_a'),
    )

I create a row_a in table a, and I put its id as member of the list my_a in 
row_b of table_b. 

Suppose I then delete row_a.  What happens? 

   1. row_b is unaffected
   2. The reference to row_a in field my_a of row_b is removed
   3. row_b is removed
   4. Other?

Many thanks,  Luca

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