text: CALL createUser('user1', 'pass1', @user1);
  CALL createUser('user2', 'pass2', @user2);
  CALL createUser('user3', 'pass3', @user3);
  
  CALL createEmail('user1@example.com', @user1);
  CALL createEmail('user21@example.com', @user2);
  CALL createEmail('user22@example.com', @user2);
  CALL createEmail('user31@example.com', @user3);
  CALL createEmail('user32@example.com', @user3);
  CALL createEmail('user33@example.com', @user3);