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I'm aware of the Hofstadter Male and Female sequences, which are a pair of integer sequences defined via mutual recursion:

$$ M(0) = 0 $$ $$ F(0) = 1 $$

$$ M(n) = n - M(F(n-1)) $$ $$ F(n) = n - F(M(n-1)) $$

Are there any known examples of three or more integer sequences defined in similar mannner (via indirect recursion)?

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