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<img src='content_image/589571.jpg'>

<img src='content_image/589573.jpg'>

## C. TRIANGULAR PATCH AT FRONT LEADING EDGE OF RIBS. 

## INSIDE VIEW 

<img src='content_image/589572.jpg'>

<img src='content_image/589574.jpg'>

## D. FOUR-SIDED PATCH AT FORWARD LEADING EDGE OF RIBS. 

## INSIDE VIEW 

