natcls_guessing_20.jpg
The image displays a hand-drawn diagram on a white background, illustrating a classification of vowel sounds using International Phonetic Alphabet (IPA) symbols. The text and diagrams are in black ink, with red arrows indicating categories.

At the top of the diagram, there is a long, horizontal, rounded rectangle. Inside this shape, from left to right, are the symbols: i, y, ʉ, u. To the right of this shape, an arrow points towards it with the label "high vowels".

On the middle right side, there is a vertical rectangular box containing two symbols stacked on top of each other: o and ɔ (an open-o). An arrow points from the text "mid back rounded vowels" to the left, indicating this group.

In the lower section, there are several distinct groups and labels:
- On the far left is the symbol æ.
- To the right of that, a connected shape contains the symbols e, ø, and œ.
- Below the ø and œ area, there is an oval shape containing the symbols ʌ (a lambda) and a. This
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