ofn-tiles : example image

[gimpygirl]

How to extract the tiles (the fonts) of this specific image using ofn-tiles ?
It are not squares

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And if it's not possible using ofn-tiles , then I can only do it using below?

- making guides between the tiles
- python_fu_ofn_guillotine_layer
- python_fu_ofn_export_layers

Or is there another more easy way with script/plugin that is available somewhere?

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Can I do this with gmic?