Solved

1. (?X)(?y)f(x,y)=f(y,x) 2. (?X)f(x,o)=o / (?X)f(o,x)=o

Question 168

Essay

1. (?x)(?y)f(x,y)=f(y,x)
2. (?x)f(x,o)=o / (?x)f(o,x)=o

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