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Author's words:
What you need:
10 hexagons + 16 pentagons
I suggest you not to knit the last row, but instead to combine elements during assembly.
Collect them, see the table below. It may look a bit confusing (and I’m not 100% sure it’s right), but when connected, the parts will look much more logical.
Here you can see the balloon inside.
Source : https://www.liveinternet.ru/users/vera-l/post366469220/