How do you JOIN two tables as a combination of LEFT and RIGHT JOINs?

This is probably a stupid question. In two tables of

CREATE TABLE t1 ( id int(11) unsigned NOT NULL, col1 int(11) unsigned NOT NULL, PRIMARY KEY(id) ) ENGINE=InnoDB;  CREATE TABLE t2 ( id int(11) unsigned NOT NULL, col2 int(11) unsigned NOT NULL, PRIMARY KEY(id) ) ENGINE=InnoDB;  INSERT INTO t1 (id,col1) VALUES (1,2), (3,5), (11,3); INSERT INTO t2 (id,col2) VALUES (1,1), (3,4), (10,2); 

How do you JOIN tables to include missing ids too?

id  col1    col2 1   2       1 3   5       4 10  NULL    2 11  3       NULL