(1A) Examples of Non-Directive labels (1B) Examples of Semi- directive FOPs (1C) Examples of Directive FOPs. BixLaura Prashant SundarRaghav M. BelloNora PeltierChad J. WeatherspoonLorraine W. BeckerMark 2015 <p>(1A) Examples of Non-Directive labels (1B) Examples of Semi- directive FOPs (1C) Examples of Directive FOPs.</p>