[Avodah] Source of Ibn Ezra word square

[Joshua Meisner]

A chaveir pointed me to the following word square produced by the Ibn Ezra
referring to the question of whether an insect that falls into honey makes
it non-kosher (hopefully the formatting will come out ok):

פ ר ש נ ו
  ר ע ב ת ן
  ש ב ד ב ש
  נ ת ב ע ר
  ו נ ש ר ף

Where does he bring this down?  I wasn't aware that the Ibn Ezra produced
any halachic writings that would provide a context for this statement.

Thanks,

Josh
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