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<br /> <br />.. <br /> <br />. <br />'.. <br />". <br /> <br /> <br />-- <br /> <br />:.. <br />" <br />.'., , <br /> <br />.' <br /> <br />..\"..... <br /> <br />>. <br />,. <br />! <br /> <br />........: <br /> <br />ACTIVE, UNENTRENCHED FAN. <br /> <br /> <br />. ... <br /> <br />DEEPLY ENTRENCHED FAN. <br /> <br />FIGURE 3,2 <br /> <br />MORPHOLOGY OF THE Two FAN TYPES <br />(FROM HOOKE, 1968) <br /> <br />29 <br /> <br />