for each two pairs of computers (s,f)(s,f)(s,f) and (x,y)(x,y)(x,y) (s≠f,x≠y)(s≠f, x≠y)(s=f,x=y), such that s,f,xs, f, xs,f,x are from the same set but xxx and yyy are from different sets, as,f<ax,ya_{s,f}<a_{x,y}as,f<ax,y.
这句话怎么翻译,没弄明白/kel