In certain example embodiments, the velocity of the air/wind may be increased within the channel by virtue of features including, for example, {HEAD ~ retractable and directional vanes} and {TAIL ~ side wall elements} that help create constricting locations  
In certain example embodiments , the velocity of the air / wind may be increased within the channel by virtue of features including , for example , { HEAD ~ retractable and directional vanes } and { TAIL ~ side wall elements } that help create constricting locations
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