Group A
- controller
- patrolled
- forbidden
- conferred
- preferred
Group B
- unforgettable
- deferred
- expelled
- transmitting
- deterring
Group C
- occasionally
- occurring
- incurred
- propeller
- admitting
Group D
- omitted
- permitted
- acquitted
- overlapping
- handicapped
Group A
Group B
Group C
Group D