f0, f1, f2, f3, f4, f5, f6, f7) | 1 => (f0, x :: f1, f2, f3, f4, f5, f6, f7) | 2 => (f0, f1, x :: f2, f3, f4, f5, f6, f7) | 3 => (f0, f1, f2, x :: f3
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