bend, acute, round
bend, acute, sharp
bend, rignt, round
bend, rignt, sharp
bend, obtuse, round
bend, obtuse, sharp
contraction, graduel
contraction, abupt
expansion, graduel
expansion, abupt
splitting, straight branch
splitting, deflected branch
junction, straight branch
junction, deflected branch
area obstruction 20%
obstruction 40% area
doorway, open
overcast airway
inlet
discharg
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