-- Database schema
| list : LastName [ TEXT ] primary_key , FirstName [ TEXT ] , Grade [ INT ] , Classroom [ INT ] | teachers : LastName [ TEXT ] primary_key , FirstName [ TEXT ] , Classroom [ INT ] |
-- -- Find the number of students taught by TARRING LEIA.

SELECT count(*) FROM list AS T1 JOIN teachers AS T2 ON T1.classroom  =  T2.classroom WHERE T2.firstname  =  "TARRING" AND T2.lastname  =  "LEIA";