select distinct e.emp_name
from employees as e
join salaries as s on s.employee_id = e.employee_id
where e.emp_name like 'W%' and
e.emp_name not in (
    select distinct e.emp_name
    from employees as e
    join salaries as s on s.employee_id = e.employee_id
    where e.emp_name like 'W%' and s.project_id in(
        select s.project_id
        from employees as e
        join salaries as s on s.employee_id = e.employee_id
        where e.emp_name = 'Wolf'
    )
)