multiple accessInherits at acl

hi. my acl is like :

$guestRoles = new Role('guest');

$userRoles = new Role('user');

$secretary = new Role('secretary');

$consultant = new Role('consultant');

$managerRoles = new Role('manager');

$adminRoles = new Role('admin');

i want to have the "secretary","consultant","manager" above the user role and admin role above this three role .

$acl->addRole($guestRoles);

$acl->addRole($userRoles, $guestRoles);

acl->addRole($managerRoles, $userRoles);

$acl->addRole($secretary, $userRoles);

$acl->addRole($consultant, $userRoles);

$acl->addRole($adminRoles, $consultant);

$acl->addRole($adminRoles, $secretary);

$acl->addRole($adminRoles, $managerRoles);

is this the correct way to implement ? i want adminRole to inherit 3 role that are the same level .