\[\begin{align} &A \left( x \right) \\ &A \left( x \right) \land A \left( x \right) \\ &\left( A \left( x \right) \land A \left( x \right) \right) \rightarrow B \left( x, y \right) \\ &B \left( x, y \...A(x)A(x)∧A(x)(A(x)∧A(x))→B(x,y)B(x,y)(A(x)∧A(x))→B(x,y)B(x,y)→A(x)(A(x)∧A(x))→A(x)