UserPrincipal - filter by multi values on a property

Question

I need to get all the users where the employeeType != G, J and L All the examples I see for query-by-example are for a single value.. UserPrincipal qbeUser = new UserPrincipal(ctx); qbeUser.Name = "Bruce"; PrincipalSearcher srch = new PrincipalSearcher(qbeUser); ... Blah

How would I do this.. Notice this is a NOT equal to and it is several values for a single property..

Thanks in advance.