Unknown column error with UNION and INTERSECT

create table t10 (a int , b int);

insert into t10 values (1,1),(1,1);

create table t11 (a int , b int);

insert into t11 values (2,2),(2,2);

create table ten(a int);

insert into ten values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);

explain 

select * from ten A, 

 (select * from t10 union select * from t11 intersect 

  select * from t11) T 

where T.a=A.a;

ERROR 1054 (42S22): Unknown column 'T.a' in 'where clause'