Monday Mutant 52: Spirits of Serpentine (cipher)

In this Spirits of Serpentine puzzle, most of the given numbers have been replaced by letters; all instances of a particular letter represent the same number, but two different letters must represent different numbers. The rules are otherwise unchanged.
The two given numbers look very similar to the letters S and O; if you find yourself confused, just remember that the only letters in this puzzle are the ones in the word BANKER.

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