Round 1: $L, R \Rightarrow R \ || \ (f(R) \oplus L)$ Round 2: $R, (f(R) \oplus L) \Rightarrow (f(R) \oplus L) \ || \ (f(f(R) \oplus L) \oplus R)$ Round 3: $(f(R) \oplus L), (f(f(R) \oplus L) \oplus R) \Rightarrow (f(f(R) \oplus L) \oplus R) \ || \ f(f(f(R) \oplus L) \oplus R) \oplus (f(R) \oplus L)$ $X = f(R) \oplus L$ $Y = f(X) \oplus R = f(f(R) \oplus L) \oplus R$ $\Rightarrow (f(X) \oplus R) \ || \ f(f(X) \oplus R) \oplus X$ $\Rightarrow Y \ || \ f(Y) \oplus X$
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