A singer is crowd surfing.
A singer is crowd surfing
A singer is crowd surfing is exactly the same as A singer is crowd surfing.
exists p1 x1.(exists x2 x3.((x1 = x2) & n_surfing(x2) & of(x2,x3) & n_crowd(x3)) & n_singer(x1))
exists p1 x1.(exists x2 x3.((x1 = x2) & n_surfing(x2) & of(x2,x3) & n_crowd(x3)) & n_singer(x1))